Using fetchmail is prone to be problematic. Search forums for examples of this.
I have been using the Fetchmail contrib for a long time and havent found it to be problematic. Although it offers a five minute polling time, I have found 15 minute polling time better. Have experienced a couple of minor niggles when a polling cycle wants to start before a previous cycle has finished (hence the 15 minute poll) but I certainly would not classify it as being problematic.
A decent internet connection helps a lot too.
That contrib will also distribute the mail to multile mailboxes.
I also pull mail from a catch-all mailbox and let SME distribute it. (concurrently with Fetchamil contrib) That works just fine too.
My experince has been excellent and it certainly has not caused me to loose any hair.
david000, the things you dont mention are the volumes of mail and the type of mail. ie a couple of lines of plain text or a small/medium/large attachment etc. One or both of these things could be a real game - changer.
P