After sending the mail I get an error (return receipt) something like this:
Error transferring to mail.domainname.zz; SMTP Protocol Returned a Permanent Error 554 5.7.1 : Helo command rejected: HELO_DYNAMIC Generic / dynamic helo/ehlo is not allowed here
How do I fix this error?
Subject: Telnet
You may want to try a telnet conversation from within your environment as well as from the outside.Issue a helo j and see what response you get back. * The J can be anything but there has to be something after the helo command.
This may be due to the recipients security settings, or it may be your DNS provider.
A typical SMTP conversation includes:
Connection on Port 25
Helo command
Mail from:
RCPT to:
Data command
period to end conversation
Good luck