+1 inbound packets with destination ports 25, 456, and 587
From: AF <[email protected]> On Behalf Of Dennis Burgess Sent: Sunday, February 06, 2022 10:30 PM To: AnimalFarm Microwave Users Group <[email protected]> Subject: Re: [AFMUG] Blocking email servers Inbound port 25, and 456.. I have lots of customers that block inbound to many ports, 81, 8080, 8181, 888, 21-25, 53, 123, 161, etc.. Unless they pay for a static.. Dennis Burgess, Mikrotik Certified Trainer MTCNA, MTCRE, MTCWE, MTCTCE, MTCINE, MTCSE, HE IPv6 Sage, Cambium ePMP Certified Author of "Learn RouterOS- Second Edition” Link Technologies, Inc -- Mikrotik & WISP Support Services Office: 314-735-0270 Website: <http://www.linktechs.net/> http://www.linktechs.net Create Wireless Coverage’s with www.towercoverage.com From: AF <[email protected] <mailto:[email protected]> > On Behalf Of Chuck McCown via AF Sent: Sunday, February 6, 2022 7:34 PM To: AnimalFarm Microwave Users Group <[email protected] <mailto:[email protected]> > Cc: Chuck McCown <[email protected] <mailto:[email protected]> > Subject: Re: [AFMUG] Blocking email servers We just want to prevent residential email hosting. Sent from my iPhone On Feb 6, 2022, at 6:12 PM, Ron M. <[email protected] <mailto:[email protected]> > wrote: Gonna need more than just 25/tcp (SMTP). Will also need 465/tcp (SMTPS) and 587/tcp (SUBMISSION)... and you'll need to tie it to the user's IP/block obviously.... otherwise you'll have a LOT of unhappy users. Further commentary can be found here: https://www.mailgun.com/blog/which-smtp-port-understanding-ports-25-465-587/ On Sat, Feb 5, 2022 at 10:10 PM Steve Jones <[email protected] <mailto:[email protected]> > wrote: Ive been intending to block it inbound/outbound for some time. in 2022, other than mail server theres no legitimate reason to use that port. On Sat, Feb 5, 2022 at 9:22 PM TJ Trout <[email protected] <mailto:[email protected]> > wrote: Yes, or on the customer's router, either way. We block 25 but I'm not sure that is customary nowadays? On Sat, Feb 5, 2022 at 5:45 PM Chuck McCown via AF <[email protected] <mailto:[email protected]> > wrote: Would that be something you would configure in the border/edge router? From: TJ Trout Sent: Saturday, February 5, 2022 6:32 PM To: AnimalFarm Microwave Users Group Subject: Re: [AFMUG] Blocking email servers block port 25 outgoing On Sat, Feb 5, 2022 at 5:23 PM Chuck McCown via AF <[email protected] <mailto:[email protected]> > wrote: What is the best way to prevent customers from running their own email server? -- AF mailing list [email protected] <mailto:[email protected]> http://af.afmug.com/mailman/listinfo/af_af.afmug.com _____ -- AF mailing list [email protected] <mailto:[email protected]> http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list [email protected] <mailto:[email protected]> http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list [email protected] <mailto:[email protected]> http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list [email protected] <mailto:[email protected]> http://af.afmug.com/mailman/listinfo/af_af.afmug.com -- AF mailing list [email protected] <mailto:[email protected]> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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