[Outages-discussion] Delayed Posts?

[Jeremy Chadwick]

I think that may be the case, but a detailed analysis would need to be
done on the part of a sender (who has control of their own outbound mail
server) and Jay and/or Jared.  I fall into the former category since I
run a VPS with postfix, with a one caveat: I use AWS SES (us-west-2) for
my outbound mail.  ;-)

The two things I saw happen on 12/15 with regards to outages were:

1) Delayed mails coming from puck.  That is to say: puck wasn't sending
outbound mail (to recipients) as fast as usual.  I saw a ~12 minute
delay (SMTP-wise) from when I sent my initial reply to Rusty to when I
got a copy,

2) Received 12 duplicates of the aforementioned reply, over the course
of a few hours.  This was either an AWS problem (i.e. networking issues
in us-west-2 manifested very badly), or an SMTP-level problem between
puck and AWS (Jay/Jared would need to check postfix logs there to see
what happened).  AWS SES us-west-2 was involved here too, obviously.

Regarding #2, I'll send them an off-list email with all the technical
details rather than clutter up this thread.

-- 
| Jeremy Chadwick                              jdc_at_koitsu.org |
| UNIX Systems Administrator                      PGP 0x2A389531 |
| Making life hard for others since 1977.                        |

On Wed, Dec 15, 2021 at 02:24:34PM -0700, Grant Taylor wrote:
> On 12/15/21 9:48 AM, Anthony Hoppe wrote:
> > seems the delay increased as the thread grew
> 
> I wonder if the mail server is having problems trying to connect to MXs 
> in / associated with AWS and thus having to time out each connection.
> 
> I would hope that Postfix has some sort of (maybe optional) inteligence 
> to know that the recipient host was down when it last tried, so maybe 
> don't try it again for an hour.  I don't know Postfix nearly as well as 
> I do Sendmail.  This is standard / best practice with Sendmail.
> 
> 
> 
> -- 
> Grant. . . .
> unix || die
> 
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