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The email address we are sending to is using 'Grey listing' as a defensive strategy and what I can gleam is the following:

All emails are rejected the first time with a 4xx error from the server back to our SMTP. It then waits for the SMTP to do a resend, and as long as the resend happens before 4 hours and longer than 25Min its happy and will deliver the second mail it then should whitelist the email sender and no more delays.

What is webfactions policy around 4xx errors, and what is the set resend time? If its shorter than 25 min or longer than 4 hours is it possible to set this to 30min?

asked 12 Apr, 06:02

reconfine's gravatar image

reconfine
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edited 12 Apr, 06:02

Our mail servers are Greylisting compliant. Please open a support ticket so that we can specifically check the logs.

(12 Apr, 22:12) NickR ♦♦ NickR's gravatar image

awesome, thanks for that - I've done some more digging it looks like we are using sendgrid to send the email after all. But good to know the webfaction policy on this for the future. thanks!

(12 Apr, 22:35) reconfine reconfine's gravatar image
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question asked: 12 Apr, 06:02

question was seen: 67 times

last updated: 12 Apr, 22:35

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