Email service without SSL authentication

Does anyone know an email service that doesn't require the SSL or TLS authentication to send mails throught smtp?

Edit: I don't know almost anythings about smtpm servers; the PC of my customer is really ancient and I cant install anything on it.

My hoster said that we can turn of for that domain the ssl auth for the IP auth, and should work, but obviously my customer doesn't have a static IP address for his connection.

Solution 1:

Providing authentication details does not necessarily imply using encryption such as SSL.

So, if one cannot use the internet provider's SMTP server like A Dwarf suggested (which would actually do authentication based on the connection details, instead of login credentials), then entering some username and password without explicitely using SSL might still work very well.

(Note that a few SMTP servers only support username/password authentication when connecting through some specific port, like 587 aka Submission Identification Port, or even only on a specific domain like authsmtp.example.com. SSL by default uses port 465, regardless of any authentication.)

Some providers also support authentication using POP before SMTP.

Though you claim you cannot install anything: if you could install DeleGate then it might be configured as a SMTP to SMTPS gateway (a bit like the question Force web address to go through https here on Super User)... So, if all else fails: what OS are you on?

Solution 2:

Your ISP's SMTP (and even POP3) servers most probably doesn't require SSL or TLS encryption. Configure your device to those addresses and give it a shot.

Otherwise if this is being done on your computer you can also set your own SMTP server for mail forwarding. Programs like Free SMTP Server or PHP SMTP Server will allow you to do just that.