Some sendmail tips with AWS and Debian - Jon Allen's Linux Stuff

Configuration
1. strings use left tick – hex 60 on left, hex 27 at the end. PAY attention
2. error – DNS Host unknown (Name server: ‘some-smtp.server.com’)
  1. This error is caused by using python/bash like single ticks on both sides
  2. ```
  `SMART_HOST', `email-smtp.eu1.amazonaws.com'
```
AWS uses port 587 – don’t even bother trying to use port 22.
1. it will not respond.
2. this will appear in log as “Deferred: Connection reset”
3. change port and see if the connection works.
use the make all command after making changes to sendmail.mc
1. Saves a backup
2. prevents some dangerous typos – especially if following other HOWTOs
Restart sendmail.
1. ```
service sendmail restart
```
Configure saslauthd or authentication.
1. ```
yum -y install cyrus-sasl cyrus-sasl-md5 cyrus-sasl-plain
```
2. https://www.cyrusimap.org/sasl/
dovecot for pop3d to get email off the server
1. ```
yum install dovecot-imapd dovecot-pop3d
```