Resolving "451 Could not complete sender verify callout" errors

[whitecurve]

It seems that some exim mail servers implement sender verify callout and when my clients send mails to users on these servers the mails do not reach them.


They instead get a bounce back informing them
Remote host said: 451 Could not complete sender verify callout

Does any know how to resolve this on a plesk 8.+ server...?

 

[Satoriya]

Hello,

the same problem was discussed in this thread:
http://forum.swsoft.com/showthread.php?t=37111

I hope, you will a solution there.