Solved

Redhat Fedora 5 sendmail configuration

Posted on 2006-10-26
9
1,171 Views
Last Modified: 2013-12-17
I need a simple step-by-step procedute to modify and re-compile the sendmail.cf file to use an outside server to relay email sent by the server using the mail command. It appears that the services provider (or the router) is blocking outgoing messages from a localhost address.

Thanks
0
Comment
Question by:thomaswright
9 Comments
 
LVL 5

Assisted Solution

by:arvind
arvind earned 150 total points
ID: 17818037
0
 
LVL 3

Author Comment

by:thomaswright
ID: 17818340
The instructions are very nice, but don't work for me. (I tried them). It appears that comcast is blocking something on their end. I have a legimated mail server at rackspace but need to send mail from various linux boxes at client sites which autocomatically lets me know when the backup job scripts complete. I think comcast is trying to block  home linux users from spamming. Any other suggestions using sendmail?
0
 
LVL 8

Accepted Solution

by:
nitadmin earned 200 total points
ID: 17825981
Yes, Most large ISPs (cable companies, DSL providers) do block or re-direct port 25.
This is control Spam from being sent by customers using their service.

You could do either of the following.

1. Change the SMTP port number to something besides 25,
2. Keep smtp port 25 and Use authenticated SMTP connections.
3. Relay your e-mail through the ISPs smtp server. ( this is not good idea if you are sending a lot of e-mails because then they may brick you internet access, because they will suspect that you are sending out spam)

Cheers,
NITADMIN
0
Ransomware: The New Cyber Threat & How to Stop It

This infographic explains ransomware, type of malware that blocks access to your files or your systems and holds them hostage until a ransom is paid. It also examines the different types of ransomware and explains what you can do to thwart this sinister online threat.  

 
LVL 34

Assisted Solution

by:PsiCop
PsiCop earned 150 total points
ID: 17829630
RedHat ought to be ashamed of the crappy sendmail.mc they ship with all their products (including RHEL). Of course, I'm hard-pressed to think of a *NIX vendor that does much better.

Take a look at this PAQ --> http://www.experts-exchange.com/Networking/Email_Groupware/Sendmail/Q_21322113.html
0
 
LVL 3

Author Comment

by:thomaswright
ID: 17921058
Thank you. That PAQ is helpful. It does give insight to the issue. I'm still working on a tested resolve though.
0
 
LVL 3

Author Comment

by:thomaswright
ID: 18196882
If you can close the question and refund points I guess that would be the best course of action.  Although there are several 'tips' out there I could not find an easy solution to the problem.

For future refrence for those viewing this article from a search, after making changes to the /etc/mail/sendmail.mc file you would recompile sendmail using the following sequence of commands:

m4 /etc/mail/sendmail.mc > /etc/sendmail.cf
makemap hash /etc/mail/access.db < /etc/mail/access
/etc/init.d/sendmail restart
0
 
LVL 34

Expert Comment

by:PsiCop
ID: 18202855
Seems to me that some help was rendered and that awarding some points is warranted. But I'm not going to get into an argument over the issue.
0
 
LVL 3

Author Comment

by:thomaswright
ID: 18202882
Sorry, I did award points, thanks for the effort guys!
0

Featured Post

Free Tool: Postgres Monitoring System

A PHP and Perl based system to collect and display usage statistics from PostgreSQL databases.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

Suggested Solutions

Microsoft has released various new features which are capable of handling various tasks. One of these tasks is ‘Migration from pop3 to Exchange Server’. Pop3 data stores various data along mailboxes like contacts, tasks, etc. So, it becomes the need…
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…
Familiarize people with the process of utilizing SQL Server stored procedures 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 Micr…
In this video we show how to create an Address List 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 Organization >> Ad…

756 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