When you attempt to send an email, something along the lines of the following will occur:
1) Your email client will resolve the specified SMTP server name to an IP address
2) Your email client will attempt to connect to the relevant IP address using the relevant port
3) The MTA running on the relevant port at the relevant IP will then do many things whilst dealing with the email transaction from your email client and will log certain details
What you'd need to do is:
1) Check what SMTP server you have specified in your email client
2) Check that the SMTP server resolves to the correct IP address
If, by the above two checks, you are sure that your mail client is trying to connect to the correct IP (and on the correct port), then you will have an entry in the Exim logs of the email transaction.
Try to send a message to [email protected]
, wait about 30 seconds and then run the following command:
Be sure to replace '[email protected]
' with a valid email address that you know is working.
If the output of the above command is nothing at all, then connections aren't getting through to Exim for one of many reasons, including:
1) The SMTP server specified in your email client is incorrect
2) The SMTP server specified in your email client does not resolve to the IP address you think it should be
3) You have a local firewall issue
4) Your ISP does not let you connect to port 25 on any servers other than their own
5) Your server has a firewall issue
6) Exim is running on a different port
7) One or more other reasons
If you do get output from the above command, take a look at it, see what it says and figure things out - Google is often very useful. If you can't figure things out, post the output here for others to digest.