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How to set up an email client
Email server limits - Windows Hosting
How to redirect URL without WWW to URL with WWW using .htaccess
How to redirect HTTP to HTTPS using .htaccess
How to use .htaccess and .htpasswd configuration files
How to display errors in PHP application
How to send a simple email message [VB.NET]
How to send a simple email message [C#]
550 5.7.1 We do not relay, account limits apply
554 5.7.1 Message cannot be accepted, spam rejection
554 5.7.1 Message cannot be accepted, spam filter rejection
554 5.7.1 Message cannot be accepted, filter rejection
554 5.7.1 Message cannot be accepted, content filter rejection
554 5.3.4 Message size exceeds fixed maximum message size
554 5.3.1 Maximum message size exceeded
554 5.2.2 Maximum mailbox size exceeded
552 5.5.3 Too many recipients
551 5.1.1 No such user found
551 5.1.1 No such mailing list found
550 5.7.1 You have rights to send mail to local domains only
550 5.7.1 We do not relay
550 5.7.1 Permission denied
550 5.7.1 Access to not allowed by rules
550 5.7.1 Access not allowed
550 5.1.1 Unknown user; rejecting
550 5.1.1 Unknown local user
530 5.7.1 Authentication required - AUTH
504 5.7.6 Unrecognized authentication type
503 5.5.1 Incorrect command sequence
503 5.5.1 HELO/EHLO command required
503 5.5.1 HELO/EHLO already specified
503 5.5.1 Authentication already done
502 5.5.1 Sorry, we do not support this operation
501 5.7.1 Permission denied
501 5.7.0 Authentication failed
501 5.5.4 Syntax error in parameters scanning
501 5.5.2 Unbalanced
501 5.5.2 Domain name required
501 5.5.1 HELO/EHLO requires domain address
501 5.0.0 Authentication canceled
500 5.5.1 Command unrecognized