Hi Zhang,

You closed a Pro thread that was not finished:

https://forum.iredmail.org/topic16990-a … dress.html

You stated:

I replied:

Let me try again.

The two (three with the comment) lines in /etc/postfix/helo_access.pcre look like this:

# bypass some HELOs which contains IP address
/^o\d{1,3}-\d{1,3}-\d{1,3}-\d{1,3}\.unifiedlayer\.com$/ DUNNO
/^o\d{1,3}-\d{1,3}-\d{1,3}-\d{1,3}\.outbound-mail\.sendgrid\.net$/ DUNNO

You replied as above and I moved the "unifiedlayer" line above the "sendgrid" line and it worked as expected. However, if 99 to 99.99999% of emails are not from Sendgrid, then they do not match that line, so then the next line (which *was* the "unifiedlayer" line) should be compared. When the "unifiedlayer" line was the second line, it would have been the "first match". Now with the "sendgrid" line second, I wonder if any emails from Sendgrid will not match and they will be bounced.

Why wasn't the "unifiedlayer" layer line being compared when it was the second line? A link as an answer will be fine.

Thanks.

Craig