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Are there special considerations for opening port 587 on a firewall?
Posted on 2016-10-28
Our ISP has required us to switch our SMTP traffic from port 25 to 587. (Interesting note: We are a business with a business account.)
I have duplicated the STMP configuration lines in our firewall, replacing “SMTP” with “587”. I think the port is now open.
Someone claims they are not seeing traffic sent on port 587, and has asked us to prove it is not an issue on our firewall. We are receiving traffic on port 587.
Would there be additional steps after opening the port such as setting some kind of authentication or encryption in the firewall for port 587?
I have duplicated the STMP configuration lines in our firewall, replacing “SMTP” with “587”. I think the port is now open.
Someone claims they are not seeing traffic sent on port 587, and has asked us to prove it is not an issue on our firewall. We are receiving traffic on port 587.
Would there be additional steps after opening the port such as setting some kind of authentication or encryption in the firewall for port 587?
[X]
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11 Comments
Active today
This is the config:
access-list 101 extended permit tcp any host xxx.xxx.xxx.xxx eq smtp
static (inside,outside) tcp interface smtp xxx.xxx.xxx.xxx smtp netmask 255.255.255.255
access-list 101 extended permit tcp any host xxx.xxx.xxx.xxx eq 587
static (inside,outside) tcp interface 587 xxx.xxx.xxx.xxx 587 netmask 255.255.255.255
access-list 101 extended permit tcp any host xxx.xxx.xxx.xxx eq smtp
static (inside,outside) tcp interface smtp xxx.xxx.xxx.xxx smtp netmask 255.255.255.255
access-list 101 extended permit tcp any host xxx.xxx.xxx.xxx eq 587
static (inside,outside) tcp interface 587 xxx.xxx.xxx.xxx 587 netmask 255.255.255.255
Active today
If you have a mail server and you are a business, you need port 25 open and your provider should honor that.
If you don't have a mail server and you want to send outbound mail relayed through an external server, your provider may be asking you to send that mail via port 587 (the submission port).
At any rate, if the email is outbound only, your firewall shouldn't need to be changed.
If you don't have a mail server and you want to send outbound mail relayed through an external server, your provider may be asking you to send that mail via port 587 (the submission port).
At any rate, if the email is outbound only, your firewall shouldn't need to be changed.
Active today
Thank you,
They have refused. They say they are doing this for all accounts - business and residential, weather or not they host our email or domain. We have talked to them 5 times to verify. Many people have said this is extreme.
Yes, we host our own email server onsite.
They have refused. They say they are doing this for all accounts - business and residential, weather or not they host our email or domain. We have talked to them 5 times to verify. Many people have said this is extreme.
Yes, we host our own email server onsite.
Active today
Seriously, if you have an internal mail server, then change providers.
This is worse than ridiculous.
This is worse than ridiculous.
Active today
So, between DSL, wireless, cable tv, ethernet, and ftth there is but one option?
I know some rural areas lack competition but -- no one else?
I know some rural areas lack competition but -- no one else?
Active today
Well, we don't want DSL. I am going to check windstream and level 3. Cable is monopolized by the same company giving us trouble. what is ftth? Would Ethernet be direct site to site?
Active today
fiber to the home. and yes, ethernet, with or without switching, is site to site.
definitely call windstream and l3.
this company does not deserve your business.
definitely call windstream and l3.
this company does not deserve your business.
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