What protocol are you using to connect to your mail service and what third-party apps do you need it to be compatible with? POP, IMAP, SMTP, or those protocols with various SSL/TLS implementations? Thunderbird will likely handle anything you throw at it, but I’m at a loss when you start talking about third-party apps without more info.
You need to provide more context in order get a proper answer.
What specifics you wanna know
Exactly ;)
What protocol are you using to connect to your mail service and what third-party apps do you need it to be compatible with? POP, IMAP, SMTP, or those protocols with various SSL/TLS implementations? Thunderbird will likely handle anything you throw at it, but I’m at a loss when you start talking about third-party apps without more info.