Redhat Fedora 5 sendmail configuration

Posted on 2006-10-26
Last Modified: 2013-12-17
I need a simple step-by-step procedute to modify and re-compile the 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.

Question by:thomaswright

Assisted Solution

arvind earned 150 total points
ID: 17818037

Author Comment

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?

Accepted Solution

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)

LVL 34

Assisted Solution

PsiCop earned 150 total points
ID: 17829630
RedHat ought to be ashamed of the crappy 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 -->
Do email signature updates give you a headache?

Do you feel like you are constantly making changes to email signatures? Are the images not formatting how you want them to? Want high-quality HTML signatures on all devices, including on mobiles and Macs? Then, let Exclaimer solve all your email signature problems today.


Author Comment

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

Author Comment

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/ file you would recompile sendmail using the following sequence of commands:

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

Expert Comment

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.

Author Comment

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

Featured Post

Why won’t your email signature format correctly?

Struggling to get your corporate email signatures to format correctly? Does the logo keep resizing? Is the text appearing too big? What can you do to prevent this? Find out how you can save your signatures today.

Question has a verified solution.

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

When it comes to providing great business solutions, IBM and Microsoft are the two top companies excelling in the art. Both launch similar products aimed at a wide audience set and have a good customer satisfaction rate. Since their products are qui…
This short article will present "How to import ICS Calendar onto Office 365 Calendar". I was searching for free (or not free) tools to convert ICS to CSV without success. The only tools I found & working well were online tools...this was too hard to…
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 Resource Mailbox in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: Navigate to the Recipients >> Resources tab.: "Recipients" is our default selection …

861 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

Need Help in Real-Time?

Connect with top rated Experts

23 Experts available now in Live!

Get 1:1 Help Now