Sendmail what is relay

Thanks a lot for any hint Dirk. SirDice Administrator Staff member. Click to expand Geezer Aspiring Daemon Reaction score: Messages: Geezer that doesn't configure sendmail to forward all mail to a relay server.

It configures sendmail to be a relay host. As root: Code:. SirDice said:. This is where my question is. Asstute readers will notice that pmx0. This is the outside? MX server for the bresnan. Apparently bresnan has their network configured so that you can not access this server from within their own network and instead must use the mail. The problem is that I don't know how to tell sendmail to use this server and not the domain.

Again, props goes to webmin see note below for helping me learn this. As pointed out below setting up a mailertable is required. However, as pointed out in the man page , this feature also needs to be enabled in your sendmail. Also note that the mailer route does not force sendmail to use the specified server for all operations, it is based on the recipient's address.

This is actually OK for me as I only need to send to a few domains gmail, google hosted, and my work. Without it I would have gone crazy trying to figure out why my mailertable file was being ignored.

Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Email can be tricky to get right.

From poor email deliverability to IP blocklisting, web hosts can often run into a lot of issues. However, an SMTP relay service can often solve a lot of these problems. Here, we go back to basics; what is an SMTP relay service and how can it improve your business?

What does SMTP stand for? What is an SMTP relay service? An "access'' database can be created to accept or reject mail from selected domains. For example, you may choose to reject all mail originating from known spammers. The table itself uses e-mail addresses, domain names, and network numbers as keys. For example:. Would accept mail from okay. It would allow accept mail from any hosts in the sendmail.

CH or within the HSZ Local configuration error. The Mail Exchanger MX Records in the DNS configuration is just an ordered list of destinations that tells mailers where to send messages if they want to reach a given domain. The preference value tells them how desirable it is to use that destination. That's the basic idea behind MX records and mail exchangers, but there are a few more wrinkles you should know about.

What happens if a mailer finds itself at the highest preference, and has to discard the whole MX list as shown below? IN MX 10 rabbit.