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Special Forums UNIX and Linux Applications Sendmail delay: 3 mins 11 secs... Every time. Post 303002872 by Mysturji on Monday 4th of September 2017 11:07:04 AM
Old 09-04-2017
Thanks hicksd8, but that has already been set as suggested:
Code:
# grep ^DS sendmail.cf submit.cf
sendmail.cf:DS
submit.cf:DS

---------- Post updated at 13:43 ---------- Previous update was at 10:20 ----------

I've found out something that may be significant, but I'm not sure what to do with it:
"mailhost" is an alias in /etc/hosts for the old mailserver which is still active, but the preferred mailserver is "outlook", which is 3 load-balanced servers:
Code:
# nslookup outlook.fqdn.uk
Server:         10.10.0.35
Address:        10.10.0.35#53

Name:   outlook.fqdn.uk
Address: 10.10.3.47
Name:   outlook.fqdn.uk
Address: 10.10.3.48
Name:   outlook.fqdn.uk
Address: 10.10.0.171

"SVP-MAIL01" is one of those load-balanced mailservers, which mail gets forwarded to from the old mailhost in the syslog snippet below:
Code:
Sep  4 11:11:56 myldom sendmail[28520]: [ID 801593 mail.info] v84ABuq7028520: from=myuser, size=108, class=0, nrcpts=1, msgid=<201709041011.v84ABuq7028520@myldom.fqdn.uk>, relay=myuser@localhost
Sep  4 11:11:56 myldom sendmail[28521]: [ID 801593 mail.info] v84ABubQ028521: from=<myuser@myldom.fqdn.uk>, size=450, class=0, nrcpts=1, msgid=<201709041011.v84ABuq7028520@myldom.fqdn.uk>, proto=ESMTP, daemon=MTA-v4, relay=localhost.fqdn.uk [127.0.0.1]
Sep  4 11:11:56 myldom sendmail[28520]: [ID 801593 mail.info] v84ABuq7028520: to=my.name@company.uk, ctladdr=myuser (111/100), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30108, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (v84ABubQ028521 Message accepted for delivery)
Sep  4 11:15:07 myldom sendmail[28523]: [ID 702911 mail.info] STARTTLS=client, relay=mailhost.fqdn.uk, version=TLSv1.2, verify=FAIL, cipher=ECDHE-RSA-AES256-SHA384, bits=256/256
Sep  4 11:15:07 myldom sendmail[28523]: [ID 801593 mail.info] v84ABubQ028521: to=<my.name@company.uk>, ctladdr=<myuser@myldom.fqdn.uk> (111/100), delay=00:03:11, xdelay=00:03:11, mailer=esmtp, pri=120450, relay=mailhost.fqdn.uk [10.10.0.98], dsn=2.0.0, stat=Sent (<201709041011.v84ABuq7028520@myldom.fqdn.uk> [InternalId=80698140526752, Hostname=SVP-MAIL01.fqdn.uk] Queued mail for delivery)

Obviously I can't put them all in /etc/hosts with the same address, but when I took the "mailhost" line out, it failed to find any mailserver at all.
How do I tell sendmail that the mailhost is "outlook.fqdn.uk" without putting only one address in /etc/hosts?

Many thanks

---------- Post updated at 13:45 ---------- Previous update was at 13:43 ----------

P.S.
Code:
# grep hosts /etc/nsswitch.conf
hosts:  files dns

---------- Post updated at 13:46 ---------- Previous update was at 13:45 ----------

PPS: I'm not sure if this is what you meant, but...
Quote:
# grep smarthost sendmail.cf submit.cf
sendmail.cf:R$* < @ [ $+ ] : > $* $#esmtp $@ [$2] $: $1 < @ [$2] > $3 no smarthost: send
sendmail.cf:R$* < @ [ $+ ] : $- : $*> $* $#$3 $@ $4 $: $1 < @ [$2] > $5 smarthost with mailer
sendmail.cf:R$* < @ [ $+ ] : $+ > $* $#esmtp $@ $3 $: $1 < @ [$2] > $4 smarthost without mailer
sendmail.cf:# pass names that still have a host to a smarthost (if defined)
sendmail.cf:R$* < @ $* > $* $: $>MailerToTriple < $S > $1 < @ $2 > $3 glue on smarthost name
submit.cf:R$* < @ [ $+ ] : > $* $#esmtp $@ [$2] $: $1 < @ [$2] > $3 no smarthost: send
submit.cf:R$* < @ [ $+ ] : $- : $*> $* $#$3 $@ $4 $: $1 < @ [$2] > $5 smarthost with mailer
submit.cf:R$* < @ [ $+ ] : $+ > $* $#esmtp $@ $3 $: $1 < @ [$2] > $4 smarthost without mailer
submit.cf:# pass names that still have a host to a smarthost (if defined)
submit.cf:R$* < @ $* > $* $: $>MailerToTriple < $S > $1 < @ $2 > $3 glue on smarthost name


Moderator's Comments:
Mod Comment Please use CODE tags as required by forum rules!


---------- Post updated at 16:07 ---------- Previous update was at 13:46 ----------

OK, Having a better idea of what I'm looking for now, I found the solution - it's just the implementation I'm unsure of now.

I put the correct mailhost name in sendmail.cf like so:
Code:
DSoutlook.fqdn.uk

then restarted sendmail and emails get delivered in just a few seconds. Smilie

My last question on this is...
I need to add it to sendmail.cf via editing sendmail.mc and running make on it, but what's the syntax for sendmail.mc?
Do I just add the DS line as I want it to appear in sendmail.cf as it is above?

Many thanks

Last edited by RudiC; 09-04-2017 at 10:45 AM.. Reason: Added CODE tags.
 

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