{"id":736,"date":"2026-06-19T15:33:34","date_gmt":"2026-06-19T19:33:34","guid":{"rendered":"https:\/\/www.inmotionhosting.com\/support\/2011\/09\/19\/typical-email-error-messages\/"},"modified":"2026-06-19T15:43:52","modified_gmt":"2026-06-19T19:43:52","slug":"typical-email-error-messages","status":"publish","type":"post","link":"https:\/\/www.inmotionhosting.com\/support\/email\/typical-email-error-messages\/","title":{"rendered":"Common Email Error Messages"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Email problems typically fall into two categories:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Client-side configuration errors<\/strong>: Issues when setting up or using email clients (Outlook, Thunderbird, Apple Mail, etc.).<\/li>\n\n\n\n<li><strong>Server-side delivery errors<\/strong>: Indicated by bounce messages containing SMTP or Extended SMTP (ESMTP) error codes.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">This guide combines practical troubleshooting for both. Use the sections below to match your exact error message.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose Your Email Issue<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Before troubleshooting:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Note the exact error message<\/strong> or copy the full bounce email (including headers if possible).<\/li>\n\n\n\n<li>Determine if the error occurs when <strong>sending\/receiving in your email client<\/strong> (client config) or you received a <strong>bounceback message<\/strong> (SMTP code).<\/li>\n\n\n\n<li>Have cPanel access ready (to reset passwords, verify accounts, or check MX records).<\/li>\n\n\n\n<li>Know your full email address and domain.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Quick Recommendations for All InMotion Customers<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Always use <strong>SSL\/TLS encryption<\/strong> for email connections.<\/li>\n\n\n\n<li>Username is <strong>always your full email address<\/strong> (<code>user@yourdomain.com<\/code>), never just the username or cPanel username.<\/li>\n\n\n\n<li>Outgoing SMTP server <strong>requires authentication<\/strong> using the same credentials as incoming.<\/li>\n\n\n\n<li>Use InMotion\u2019s recommended settings (see below).<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Recommended Email Client Settings for InMotion Hosting<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Use these settings in Outlook, Thunderbird, Apple Mail, or any client:<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Standard Secure Settings (Recommended)<\/h4>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Protocol<\/th><th class=\"has-text-align-left\" data-align=\"left\">Server Name<\/th><th class=\"has-text-align-left\" data-align=\"left\">Port<\/th><th class=\"has-text-align-left\" data-align=\"left\">Encryption<\/th><th class=\"has-text-align-left\" data-align=\"left\">Notes<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-left\" data-align=\"left\">IMAP<\/td><td class=\"has-text-align-left\" data-align=\"left\">mail.yourdomain.com<\/td><td class=\"has-text-align-left\" data-align=\"left\">993<\/td><td class=\"has-text-align-left\" data-align=\"left\">SSL\/TLS<\/td><td class=\"has-text-align-left\" data-align=\"left\">Preferred for most users (syncs across devices)<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">POP3<\/td><td class=\"has-text-align-left\" data-align=\"left\">mail.yourdomain.com<\/td><td class=\"has-text-align-left\" data-align=\"left\">995<\/td><td class=\"has-text-align-left\" data-align=\"left\">SSL\/TLS<\/td><td class=\"has-text-align-left\" data-align=\"left\">Downloads mail to one device<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">SMTP<\/td><td class=\"has-text-align-left\" data-align=\"left\">mail.yourdomain.com<\/td><td class=\"has-text-align-left\" data-align=\"left\">465<\/td><td class=\"has-text-align-left\" data-align=\"left\">SSL\/TLS<\/td><td class=\"has-text-align-left\" data-align=\"left\">Or port 587 with STARTTLS<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">SMTP<\/td><td class=\"has-text-align-left\" data-align=\"left\">mail.yourdomain.com<\/td><td class=\"has-text-align-left\" data-align=\"left\">587<\/td><td class=\"has-text-align-left\" data-align=\"left\">STARTTLS<\/td><td class=\"has-text-align-left\" data-align=\"left\">Alternative to 465<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">If You See Certificate Warnings or &#8220;Unsecure Connection&#8221; Errors<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Switch <strong>both incoming and outgoing servers<\/strong> to your server\u2019s secure hostname:<br><code>secure##.inmotionhosting.com<\/code><br>(Replace <code>##<\/code> with your specific server number. You can find this in cPanel under Server Information or by contacting support.)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Authentication<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Select <strong>\u201cMy outgoing server (SMTP) requires authentication\u201d<\/strong><\/li>\n\n\n\n<li>Use the <strong>same username and password<\/strong> as your incoming mail<\/li>\n\n\n\n<li>Disable \u201cSecure Password Authentication (SPA)\u201d if offered<\/li>\n<\/ul>\n\n\n\n<p class=\"alert alert-info wp-block-paragraph\"><strong>Tip:<\/strong> InMotion provides an <a href=\"https:\/\/www.inmotionhosting.com\/support\/tools\/email-configuration\/\">Email Configuration Tool<\/a> that generates exact settings for your domain.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Client Configuration Errors<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">These errors usually appear when first setting up an email account or after password changes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Authentication Failed \/ Login Errors (Incorrect Password or Invalid Username)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Common Messages:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Authentication failed<\/li>\n\n\n\n<li>Login incorrect<\/li>\n\n\n\n<li>Invalid username or password<\/li>\n\n\n\n<li>535 Authentication failed (or similar)<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Causes:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Using the wrong password (email account password vs. cPanel password).<\/li>\n\n\n\n<li>Using only the username instead of the full email address.<\/li>\n\n\n\n<li>Password recently changed in cPanel but not updated in the email client.<\/li>\n\n\n\n<li>Outgoing server authentication not enabled.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>How to Fix:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list article_list\">\n<li>Log into cPanel \u2192 <strong>Email Accounts<\/strong>.<\/li>\n\n\n\n<li>Locate the email account and <strong>reset the password<\/strong> if you\u2019re unsure (use a strong password).<\/li>\n\n\n\n<li>In your email client:\n<ul class=\"wp-block-list\">\n<li>Update the <strong>username<\/strong> field to your <strong>full email address<\/strong> (<code>user@yourdomain.com<\/code>).<\/li>\n\n\n\n<li>Re-enter the <strong>email account password<\/strong> (not cPanel password).<\/li>\n\n\n\n<li>Ensure <strong>\u201cMy outgoing server (SMTP) requires authentication\u201d<\/strong> is checked.<\/li>\n\n\n\n<li>Save settings and test sending\/receiving.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>If using multiple devices, update credentials on all of them.<\/li>\n<\/ol>\n\n\n\n<p class=\"alert alert-info wp-block-paragraph\"><strong>Note:<\/strong> You must use the email account password created or reset in cPanel\u2019s Email Accounts section. The cPanel login password will not work for email.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Unsecure Connection or SSL Certificate Errors \/ Warnings<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Common Messages:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Unsecure Connection<\/li>\n\n\n\n<li>Certificate name mismatch<\/li>\n\n\n\n<li>The server\u2019s certificate does not match the domain<\/li>\n\n\n\n<li>Warning about self-signed or invalid certificate<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Causes:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Email client is configured to use SSL\/TLS but the server hostname (<code>mail.yourdomain.com<\/code>) triggers a domain mismatch warning on shared hosting.<\/li>\n\n\n\n<li>Outdated email client or missing root certificates.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>How to Fix:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list article_list\">\n<li>In your email client settings, change <strong>both<\/strong> the incoming (IMAP\/POP) and outgoing (SMTP) server names from <code>mail.yourdomain.com<\/code> to your server\u2019s secure hostname:<br><code>secure##.inmotionhosting.com<\/code><\/li>\n\n\n\n<li>Keep SSL\/TLS enabled on the recommended ports (993 IMAP, 995 POP, 465\/587 SMTP).<\/li>\n\n\n\n<li>Accept or trust the certificate if prompted (it is valid for InMotion\u2019s shared infrastructure).<\/li>\n\n\n\n<li>Test the connection again.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">This resolves the vast majority of SSL-related warnings on InMotion&#8217;s hosting plans.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">503 Valid RCPT Command Must Precede DATA<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Cause:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Your email client is attempting to send a message without properly authenticating to the outgoing SMTP server first.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>How to Fix:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list article_list\">\n<li>In your email client\u2019s outgoing server (SMTP) settings:\n<ul class=\"wp-block-list\">\n<li>Check the box for <strong>\u201cMy outgoing server (SMTP) requires authentication\u201d<\/strong>.<\/li>\n\n\n\n<li>Select \u201cUse same settings as my incoming mail server\u201d (or manually enter the same username\/password).<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Save and restart the email client.<\/li>\n\n\n\n<li>Try sending a test email.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">This is a very common issue when first configuring Outlook, Thunderbird, or similar clients.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Other Client-Side Issues<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">If you continue to see errors after the above steps:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Double-check that the email account exists in cPanel \u2192 Email Accounts.<\/li>\n\n\n\n<li>Verify your domain\u2019s MX records point to InMotion (especially after transfers or DNS changes).<\/li>\n\n\n\n<li>Update your email client to the latest version.<\/li>\n\n\n\n<li>Temporarily disable any VPN, firewall, or antivirus email scanning features.<\/li>\n\n\n\n<li>Try setting up the account on a different device or client to isolate the issue.<\/li>\n<\/ul>\n\n\n\n<p class=\"alert alert-info wp-block-paragraph\"><strong>Still stuck with client setup?<\/strong> Submit a support ticket through AMP with screenshots of your client settings and the exact error.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Prevention and Best Practices for InMotion Hosting Customers<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Use SSL\/TLS everywhere<\/strong>: Protects credentials and reduces \u201cunsecure\u201d warnings.<\/li>\n\n\n\n<li><strong>Keep credentials updated<\/strong>: Change email passwords in cPanel and immediately update all clients\/apps.<\/li>\n\n\n\n<li><strong>Monitor your sending reputation<\/strong>: Avoid high-volume sending without proper warm-up or authentication (SPF, DKIM, DMARC recommended for business domains).<\/li>\n\n\n\n<li><strong>Regularly check cPanel Email Accounts<\/strong> for quota usage and active accounts.<\/li>\n\n\n\n<li><strong>For VPS\/Dedicated users<\/strong>: Implement Fail2Ban or firewall rules to protect against brute-force attacks on port 25\/587\/465.<\/li>\n\n\n\n<li><strong>Test thoroughly<\/strong> after any DNS, MX, or account changes.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">When to Contact InMotion Hosting Support<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Contact our technical support team if:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>You have followed all steps above and the error persists.<\/li>\n\n\n\n<li>You see repeated bounce codes affecting important business email.<\/li>\n\n\n\n<li>You need help interpreting server mail logs (VPS\/Dedicated).<\/li>\n\n\n\n<li>You recently migrated email or changed DNS\/MX records.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>How to Get Help:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Log into <a href=\"https:\/\/secure1.inmotionhosting.com\/index\/login\">AMP<\/a> \u2192 Submit a Support Ticket (include full error text or bounce message + screenshots).<\/li>\n\n\n\n<li>Call 757-416-6575 x2 (Current Customers)<\/li>\n\n\n\n<li>Use Live Chat or the support portal for faster response on urgent issues.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Our team has deep expertise with Exim, cPanel, Control Web Panel, and InMotion infrastructure and can review logs, adjust settings, or escalate delivery issues with recipient providers when appropriate.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Email problems typically fall into two categories: This guide combines practical troubleshooting for both. Use the sections below to match your exact error message. How to Diagnose Your Email Issue Before troubleshooting: Quick Recommendations for All InMotion Customers Recommended Email Client Settings for InMotion Hosting Use these settings in Outlook, Thunderbird, Apple Mail, or any<a class=\"moretag\" href=\"https:\/\/www.inmotionhosting.com\/support\/email\/typical-email-error-messages\/\"> Read More ><\/a><\/p>\n","protected":false},"author":56983,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_ayudawp_aiss_exclude":false,"_ayudawp_aiss_summary":"","_ayudawp_aiss_summary_provider":"","_ayudawp_aiss_summary_hash":"","_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[4],"tags":[],"class_list":["post-736","post","type-post","status-publish","format-standard","hentry","category-email"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Common Email Error Messages | InMotion Hosting<\/title>\n<meta name=\"description\" content=\"Learn about the typical email error messages that you may receive and more about resolving those issues.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.inmotionhosting.com\/support\/email\/typical-email-error-messages\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Common Email Error Messages | InMotion Hosting\" \/>\n<meta property=\"og:description\" content=\"Learn about the typical email error messages that you may receive and more about resolving those issues.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.inmotionhosting.com\/support\/email\/typical-email-error-messages\/\" \/>\n<meta property=\"og:site_name\" content=\"InMotion Hosting Support Center\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/inmotionhosting\/\" \/>\n<meta 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