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Old 04-08-2014, 02:55 AM   #1
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How to change SENDMAIL SMTP in Fedora Core 6 Linux

Hi there
Would someone guide me in which file can i change my SMTP server, since i have changed my ISP, due to which my outgoing emails bounced back due to old ISP SMTP entry enlisted there into my linux sendmail server.
Old 04-08-2014, 02:57 AM   #2
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I am using Microsoft Outlook 2010 for email client. In outlook 2010 I have entered IP of my mail server for SMTP address.
Old 04-08-2014, 08:22 AM   #3
Registered: Jan 2014
Location: Farnborough, Hampshire - UK
Distribution: 2 * CentOS 6.10 Self-Hosted Domain Servers (Mail & Web Server / FTP & VPN Server)
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Hello Sir,

If you are simply referring to the Sendmail config file then this is what you are after:

Important: Make a backup of the file first!!!


The line that needs to be changed is:

dnl define(`SMART_HOST', `')dnl
Simply substitute with the name of your current ISP's SMTP server.

Don't forget to rebuild the file after making any changes by performing the following:

- this regenerates the file

An important note to make: As this is a live server acting as an internal / external MTA from a security point of view, consider at least moving to a newer supported version of an Op. System so that you will still receive regular updates / security fixes / patches etc. Ok you may have a learning curve, but your system provided it is correctly configured will be much more secure + you will have the added benefits of refreshing your existing skillset.




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