What ports need to be open to allow for mail?

What ports need to be open to allow for mail?

[James Marcinek]

Hello All,

I'm trying to set up my mail server; however I want to
make sure that I have the correct port(s) open. I
already have TCP port 25 open; however do I also have
to have UDP port 25 open as well? Any help would be
appreciated.

Thanks,
James

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Re: What ports need to be open to allow for mail?

[Raymond Leach]

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Hi

Depends what kind of mail:

SMTP uses tcp port 25 (no UDP necessary)
POP3 uses tcp port 110 (no UDP necessary)

HTH

Ray

On Thu, 2003-04-10 at 11:39, James Marcinek wrote:
> Hello All,
> 
> I'm trying to set up my mail server; however I want to
> make sure that I have the correct port(s) open. I
> already have TCP port 25 open; however do I also have
> to have UDP port 25 open as well? Any help would be
> appreciated.
> 
> Thanks,
> James
> 
> __________________________________________________
> Do you Yahoo!?
> Yahoo! Tax Center - File online, calculators, forms, and more
> http://tax.yahoo.com

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Re: What ports need to be open to allow for mail?

[Rasmus Reinholdt Nielsen]

port 25 tcp will do for smtp, but you will need 110 tcp as well if you need 
pop3 access from the Internet.

/Rasmus

At 02:39 10-04-2003 -0700, James Marcinek wrote:
>Hello All,
>
>I'm trying to set up my mail server; however I want to
>make sure that I have the correct port(s) open. I
>already have TCP port 25 open; however do I also have
>to have UDP port 25 open as well? Any help would be
>appreciated.
>
>Thanks,
>James
>
>__________________________________________________
>Do you Yahoo!?
>Yahoo! Tax Center - File online, calculators, forms, and more
>http://tax.yahoo.com

Re: What ports need to be open to allow for mail?

[Johannes Walch]

> Hello All,
>
> I'm trying to set up my mail server; however I want to
> make sure that I have the correct port(s) open. I
> already have TCP port 25 open; however do I also have
> to have UDP port 25 open as well? Any help would be
> appreciated.
>
> Thanks,
> James

If you want to run SMTP (the standard case) with your mail server port
25/TCP ist sufficient. Port 25/UDP is not used by sendmail or any other SMTP
server software (as far as I know).

johannes walch

Re: What ports need to be open to allow for mail?

[Jesper Lund]

> however do I also have to have UDP port 25 open as well?

No you don't. Byt maybe consider port 110 and 143 for pop3 and imap.

//Jesper

-- 
www.ballbreaker.dk/antispam.html

Re: What ports need to be open to allow for mail?

[Kim Jensen]

>I'm trying to set up my mail server; however I want to
>make sure that I have the correct port(s) open. I
>already have TCP port 25 open; however do I also have
>to have UDP port 25 open as well? Any help would be
>appreciated.
>
Extract from /etc/services:

SMTP:
smtp            25/tcp          mail
smtp            25/udp          mail
smtps           465/tcp                         # SMTP over SSL (TLS)

POP:
pop2            109/tcp         pop-2   postoffice      # POP version 2
pop2            109/udp         pop-2
pop3            110/tcp         pop-3           # POP version 3
pop3            110/udp         pop-3
pop3s           995/tcp                         # POP-3 over SSL
pop3s           995/udp                         # POP-3 over SSL

IMAP:
imap            143/tcp         imap2           # Interim Mail Access Proto v2
imap            143/udp         imap2
imap3           220/tcp                         # Interactive Mail Access
imap3           220/udp                         # Protocol v3
imaps           993/tcp                         # IMAP over SSL
imaps           993/udp                         # IMAP over SSL

Now, make you picking, standard answer is:
25 for SMTP
110 for POP3
143 for IMAP

/Kim

RE: What ports need to be open to allow for mail?

[Rob Sterenborg]

> I'm trying to set up my mail server; however I want to
> make sure that I have the correct port(s) open. I
> already have TCP port 25 open; however do I also have
> to have UDP port 25 open as well? Any help would be appreciated.

No, just port 25/tcp is fine.


Gr,
Rob