Customer updated vcenter to ersion=6.5.0, build=15259038 post which sendmail fails.
Initially issue was with reverse lookup of VCSA
unable to send mail but events are getting triggered. Checked messages log on VCSA and found below. 2021-06-29T16:36:09.871409+00:00 VCENTERAPPDC sendmail[56803]: 15TGa9fh056803: to=<, ctladdr=> (0/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30363, relay=[smpt.gmail.com], dsn=5.1.2, stat=Host unknown (Name server: [smpt.gmail.com]: host not found)
2021-06-29T16:36:09.883778+00:00 VCENTERAPPDC sendmail[56802]: 15TGa9fA056802: to=, ctladdr=root (0/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30023, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (15TGa9fh056803 Message accepted for delivery) 2021-06-29T16:39:01.108346+00:00 sendmail[57817]: 15TGd1Jq057817: to= ctladdr=> (0/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30363, relay=[[smpt.gmail.com]], dsn=5.1.2, stat=Host unknown (Name server: [[smpt.gmail.com]]: host not found)
2021-06-29T16:39:01.121246+00:00 sendmail[57816]: 15TGd1xd057816: t ctladdr=root (0/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30023, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (15TGd1Jq057817 Message accepted for delivery) 2021-07-01T08:48:36.218846+00:00 VCENTERAPPDC sendmail[43901]: 1618maon043901: to= ctladdr= (0/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30361, relay=[smpt.gmail.com], dsn=5.1.2, stat=Host unknown (Name server: [smpt.gmail.com]: host not found) 2021-07-01T08:48:36.255435+00:00 VCENTERAPPDC sendmail[43899]: 1618mZll043899: to=abc , ctladdr=root (0/0), delay=00:00:01, xdelay=00:00:00, mailer=
sendmail[56422]: gethostbyaddr(x.x.x.x) failed:
We fixed reverse lookup and that is okay .
Still fails with DNS Name : hostname not found
SMTP server entry is right in sendmail.cf, checked entries in resolv.conf for dns but no issues.
tried chamging FQDN and IP on smtp server settings on GUI still fails with same mwessage.
I just checked reverselookup for SMTP server and that fails.
Does that really matter?
the same setup worked fine in earlier versions with no issues.