by Robert Brenstein.
I wonder why you say that POP3 is old, Ken. POP3 and IMAP are about as old and neither uses secure connections. The S-variants do and these are newer indeed.
In terms of authentication, POP3 will work fine within a company. Besides putting the correct name or IP address of the server, you just need to find the correct POP-mode for your service, Franky. Simple trial and error can be used for that since there are only a few options.
Having said that, I suggest to talk to people running your mail service and check whether they also have IMAP running. Most mail server programs support both. Even if POP3 is used to retrieve mail, IMAP would be better for authentication because it does not impose exclusivity of connections. In other words, it does not conflict with fetching mails, even though that is usually not noticable by users.
In terms of authentication, POP3 will work fine within a company. Besides putting the correct name or IP address of the server, you just need to find the correct POP-mode for your service, Franky. Simple trial and error can be used for that since there are only a few options.
Having said that, I suggest to talk to people running your mail service and check whether they also have IMAP running. Most mail server programs support both. Even if POP3 is used to retrieve mail, IMAP would be better for authentication because it does not impose exclusivity of connections. In other words, it does not conflict with fetching mails, even though that is usually not noticable by users.