Re: [mailop] Anyone from Sendgrid or Twilio on this list?

[Luke via mailop]

Happy to chat offline about this. The mail they are attempting to send to
eastex.net is exclusively going to one address. This address returned *550
5.1.1 > is not a valid mailbox* on
December 23rd, 2021. After we receive a response like that, we add the
address to the sender's suppression list. This prevents future
attempts from ever leaving our system. So mail to eastex.net from this
sender *is *failing to deliver. But it is failing because mail to that
address bounced and the address is now on the user's suppression list. The
customer can simply remove the address from suppression, but if we receive
that response again, it will be re-added to the suppression list and future
attempts will be dropped.

Hope this helps. Ping me if offline if you have any questions.
Luke

On Thu, Jan 20, 2022 at 1:38 PM Atro Tossavainen via mailop <
mailop@mailop.org> wrote:

> > I’ve gotten the header from the successful test that our customer sent
> to his Yahoo account, but the IP Addresses gathered there didn’t appear in
> any of our servers logs either.
>
> Are they not either of the two you mentioned?
>
> --
> Atro Tossavainen, Chairman of the Board
> Infinite Mho Oy, Helsinki, Finland
> tel. +358-44-5000 600, http://www.infinitemho.fi/
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Re: [mailop] Anyone from Sendgrid or Twilio on this list?

[Atro Tossavainen via mailop]

> I’ve gotten the header from the successful test that our customer sent to his 
> Yahoo account, but the IP Addresses gathered there didn’t appear in any of 
> our servers logs either.

Are they not either of the two you mentioned?

-- 
Atro Tossavainen, Chairman of the Board
Infinite Mho Oy, Helsinki, Finland
tel. +358-44-5000 600, http://www.infinitemho.fi/
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Re: [mailop] Anyone from Sendgrid or Twilio on this list?

[Hans-Martin Mosner via mailop]

Am 20.01.22 um 20:37 schrieb Mike McTee via mailop:
I’m getting a complaint from a customer that they aren’t receiving emails from their Moultrie game camera when sent to 
their Eastex.net  email address.  As a test, the customer switched it to send to their Yahoo 
account and they receive the messages without issues.  I’m fairly confident that the (final hop) sending server is 
likely on one of a few RBL’s in use by our servers, but I can’t seem to get anywhere in determining for certain that 
is the case.  If this is indeed a case where the final sending IP is on an RBL in use by our servers, our logs would 
only reflect the IP Address and which RBL it was on, so a search of those logs for anything other than an IP is a 
waste of time.  Moultrie advises our joint customer that the issue is on our end and that they have no method to 
troubleshoot from their end.  They did offer a couple of IP Addresses (168.245.68.203 & 149.72.92.45) that they advise 
are their sending email servers but neither IP appears in any of our servers log files as having contacted our server. 
 A lookup of those IP’s show they belong to Sendgrid & Twilio, hence my asking if anyone from either is on here.


I’ve gotten the header from the successful test that our customer sent to his Yahoo account, but the IP Addresses 
gathered there didn’t appear in any of our servers logs either.



Can you search your server logs for sender addresses? Sendgrid's are of the form

bounces+-<4 hex digits>-=@

That should be easily searchable with standard unix/linux tools, if your server is of that kind. If you use Microsoft 
server software, my condolences.


Cheers,
Hans-Martin
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