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port 25 blocked?
Posted: 28 Nov 2017 11:17
by ameardith
Our email is sending via port 25. its always worked in the past until last week all of a sudden its stops working? is there a way to check to make sure the ports are not being blocked at the switch level?
I contacted our ISP and they verified that they are not blocking port 25 outgoing
we have 6450s poe and non poe. our core is a 6900.
i use ov2500 to manage
thanks!
Re: port 25 blocked?
Posted: 28 Nov 2017 13:34
by cavagnaro
Don't double post
Enviado de meu E6633 usando Tapatalk
Re: port 25 blocked?
Posted: 30 Nov 2017 02:55
by silvio
a lot of possibilities - commands different for 6900 and 6450:
f.e. show spantree ports, show vlan ports, show vlan members, show interface status, show interface port, show violation
regards
Silvio
Re: port 25 blocked?
Posted: 30 Nov 2017 04:26
by devnull
But RSTP or vlans would not block just smtp protocol.
It would either block all or nothing.
You could block a sinjgle port e.g. with qos rules but it should not automagically appear.
My best guess is: your ISP is lying.
Try to use submission (TCP 587) or SMTPS (TCP 465) protocol for sending - both are often supported and less likely to be blocked. You may need TLS/SSL Support or authentication for using that.