Cannot receive emails from this particular sender only.

[SuperBaby]

My customer (with his website hosted on my server) is complaining to me that they are having problems receiving (no problem with sending) emails only from this particular sender with email address "[email protected]".

When the user of [email protected] sends an email to my customer at [email protected], the sender will get a undelivered message (see below). The email cannot reach [email protected].

There is no problem for [email protected] to send email via Gmail to my customer.

Also, there is no problem for [email protected] to send an email to [email protected].

I have checked my firewall, Exim config, MailScanner rules, RBL+XBL and other config under WHM. In fact I have added the sender's IP/domain to the whitelist.

Subject: Undelivered Mail Returned to Sender

This is the Postfix program at host m2mx1.voicevalley.com.au.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to <postmaster>

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The Postfix program

<[email protected]: host mycustomer.com[69.56.xxx.xx] said: 451 Could not
complete sender verify callout (in reply to RCPT TO command)

<[email protected]: host mycustomer.com[69.56.xxx.xx] said: 451 Could not
complete sender verify callout (in reply to RCPT TO command)

<[email protected]: host mycustomer.com[69.56.xxx.xx] said: 451 Could not
complete sender verify callout (in reply to RCPT TO command)

 

[SuperBaby]

I think the problem is well-explained here: http://support.aguk.net/article.aspx?id=10153

I was told to turn off the following under Exim Config Editor:

require verify = sender/callout

Or it is possible to setup a filter to allow "[email protected]" instead of turning off the above line completely?

 

[kernow]

IMO, this is not your problem. The person clearly needs to get their mailserver to comply with RFC rules, and turning off require verify / sender/callout could cause you loads of spam problems.

 

[SuperBaby]

http://support.aguk.net/article.aspx?id=10153
RCPT Command: 5 minutes
A longer timeout is required if processing of mailing lists and aliases is not deferred until after the message was accepted.

On my side, how do I make sure that my RCTP Command is set to minimum 5 minutes? This is what I have under Exim Config Editor:

#!!# ACL that is used after the RCPT command
check_recipient:
# Exim 3 had no checking on -bs messages, so for compatibility
# we accept if the source is local SMTP (i.e. not over TCP/IP).
# We do this by testing for an empty sending host field.
accept hosts = :

What is accept hosts for?

 

[RickG]

There are many different ways to address sender verify issues including adding the sender to a whitelist.

This has been addressed in many posts on the forum, or follow the links in this thread:

http://forums.cpanel.net/showthread.php?p=271595#post27159