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503 valid RCPT command must precede DATA

When sending email, you receive an immediate bounce such as the following:Subject: RE: XXXXXX -...
551 This mail server requires authentication before sending mail from a locally hosted domain

This error could mean that you have the senders domain in your hosting/reseller account and hence...
Domain example.com has exceeded the max defers and failures per hour (5/5 (100%)) allowed

Are you getting this error returned when sending email? Chances are one of your email accounts...
Email Bounceback: Please add more content, cut down on HTML links, use fewer naughty words etc. Also, ask your IT dept to make sure your mailserver has REVERSEDNS, SPF, DKIM, and is not on any black lists.

Our spam filters at times will return the following error:   Your message to...
When I send out emails they land in the spam or junk folder on the receiver's side?

This could mean that: 1. The email being sent is too short or looks like spam.2. SPF and DKIM...