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
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

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)

Ransomware-A Revenue Bonanza for Service Providers

Ransomware – malware that gets on your customers’ computers, encrypts their data, and extorts a hefty ransom for the decryption keys – is a surging new threat.  The purpose of this eBook is to educate the reader about ransomware attacks.

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 -->

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

DevOps Toolchain Recommendations

Read this Gartner Research Note and discover how your IT organization can automate and optimize DevOps processes using a toolchain architecture.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
Spam Filter 5 111
Delete Public Folder DB after migration 4 59
Exchange 2016 Hybrid Server Specs and Roles 1 56
Configure maximum recipients in MS EXchange 2016 2 76
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…
Phishing attempts can come in all forms, shapes and sizes. No matter how familiar you think you are with them, always remember to take extra precaution when opening an email with attachments or links.
In this video we show how to create a User Mailbox 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 >> Mailb…
In this video we show how to create a Distribution Group 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 >>…

751 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