[RCU] RCM appears to be the culprit for non-delivery of some emails to GMail addresses

Philip Rhoades phil at pricom.com.au
Mon Sep 3 10:16:14 CEST 2018


This is my setup:

Fedora 28 x86_64 workstation + Firefox <=> Fedora 26 x86_64 Server + RCM 
+ QMail + multiple domains <=> Internet

I have multiple email addresses for the multiple domains I run web sites 
and mailing lists for - last night when I mailed to someone from phr AT 
philiprhoades DOT org to a their GMail address - the mail was not 
delivered.  I went through a bit of debugging with the recipient today 
and what I know so far is:

- If I use RCM and the phr email address to send mail - even though the 
QMail logs say that the mail was successfully delivered - it never 
actually arrives - BUT no bounce message is ever received either.

- If I use swaks on the server to send a test email from the phr address 
to the same person, it is delivered OK.

- If I use qmail-inject on the server to send the original email that 
failed from its Maildir Sent dir to the same person, it is delivered OK.

So it looks like something that RCM is adding to the headers is being 
objected to by the GMail servers or something - of course since nothing 
is ever actually delivered or bounced, I can't compare the header lines 
of the failed emails to the successful emails so I can't make any more 
progress trying to work out what the problem is.

I have occasionally had rDNS issues but my diagnostics don't seem to fit 
that non-delivery issue . . anyone got any ideas?  Is it possible that 
GMail servers can successfully accept emails but then silently fail to 
deliver them to recipients?


Philip Rhoades

PO Box 896
Cowra  NSW  2794
E-mail:  phil at pricom.com.au

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