Hi There
I have been using Swiftmailer to send mass emails, and have recently checked my Mail Delievery Stats in the WHM.
There are a lot of :
Rejected RCPT: Sender verify failed
Rejected RCPT: Could not complete sender verify callout
I haven't been able to find much info on these log messages, what does this mean exactly?
Sender verify Failed
Moderators: Chris Corbyn, General Moderators
- Chris Corbyn
- Breakbeat Nuttzer
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- Joined: Wed Mar 24, 2004 7:57 am
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If these are just on the log list it might not be directly frm Swift (does that SMTP server take incoming mail too?). My SMTP is full of this too because spammers try sending emails to be from addresses that don't exist.
"Sender verify failed" means that your SMTP server could not find an MX record for the email address of the sender. As in: user@no-such-place.com.
"Could not complete sender verify callout" looks fishy. That suggests that your server is trying to verify addresses not only by using the MX record, but also by issuing a VRFY command to the remote server (checks if that server really has this user at it) -- that's blocked on most hosts these days to stop spammers obtaining lists of email addresses by force.
"Sender verify failed" means that your SMTP server could not find an MX record for the email address of the sender. As in: user@no-such-place.com.
"Could not complete sender verify callout" looks fishy. That suggests that your server is trying to verify addresses not only by using the MX record, but also by issuing a VRFY command to the remote server (checks if that server really has this user at it) -- that's blocked on most hosts these days to stop spammers obtaining lists of email addresses by force.