Solved

smtp - can use any other port other than 25?

Posted on 2011-02-16
6
1,110 Views
Last Modified: 2012-05-11
can smtp use any other port for outgoing mail? how does that get configured or checked?

thanks
0
Comment
Question by:anushahanna
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
6 Comments
 
LVL 2

Accepted Solution

by:
Chewe Chileshe earned 167 total points
ID: 34908743
you can use any available port you like, as long as the sever recieving the connections is also configured to recieve smtp on the same port. Thats easy to do when using a relay server, however internet mail works on port 25 as a standard for smtp.

The configuration is dependent on what system you are using.
0
 
LVL 6

Author Comment

by:anushahanna
ID: 34909393
how can we find what port is being used in relay server situation.

port 25 is for the exchange server or the client which uses the exchange server connection to send an email?
0
 
LVL 2

Assisted Solution

by:jbordelon
jbordelon earned 333 total points
ID: 34916967
Port 25 is the open port that server listen for connection. The client should initiate tcp connection on port 25 and then negotiate a high port for return communication. In a Micosoft client like Outlook Express, you configure the SMTP port in the tools menu, accounts, properties, Advanced Options tab, and changing Outgoing Mail (SMTP) value.
You could change the server listen port by different methods depending the operating system, but you couldn't use ports that the server use for other purposes in the same IP address, by example if you use port 80 for SMTP, you cannot run a web server at this port with same IP. Microsoft IIS let you set the port that SMTP server use opening MMC, Internet Information Server, Properties, General Tab and pressing Advanced button. You could use more than one IP addresses in your server, one for SMTP at any port, and other IP for other services.
0
Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 6

Author Comment

by:anushahanna
ID: 34935831
>>then negotiate a high port for return communication.

why high port? 24 will work just fine, too, right? what is the reason for the 'high'
0
 
LVL 2

Assisted Solution

by:jbordelon
jbordelon earned 333 total points
ID: 34937810
TCP/IP protocol use source and destination ports. http://en.wikipedia.org/wiki/Transmission_Control_Protocol
When a connection is stablished, two ports are used. One of this ports is defaulted to a service (Well-known ports: 0–1023 http://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers ), for example 80 to http, 25 smtp, 21 ftp, 53 dns, etc. Otherwise you wouldn't know at wich port initiate a connection for a protocol or service. The return port could be any unused port in the range 1024-65535 and is called Ephemeral port: http://en.wikipedia.org/wiki/Ephemeral_ports
0
 
LVL 6

Author Comment

by:anushahanna
ID: 34985854
thanks.
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Cisco VPN client v5 migration to Anyconnect VPN? 8 61
ASA Tunnel 18 49
Phishing emails coming from Staff-A email account to another external email account 10 44
TZ400 2 24
Nearly six years ago I was hired by a company to be their senior server engineer. One of my first projects was to implement Exchange Server 2007 on a Windows Server 2008 Single Copy Cluster for high availability. That was the easy part; read on to l…
This process describes the steps required to Import and Export data from and to .pst files using Exchange 2010. We can use these steps to export data from a user to a .pst file, import data back to the same or a different user, or even import data t…
Familiarize people with the process of utilizing SQL Server functions from within Microsoft Access. Microsoft Access is a very powerful client/server development tool. One of the SQL Server objects that you can interact with from within Microsoft Ac…
In this video we show how to create a Contact in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center. Navigate to the Recipients >> Contact ta…

740 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question