Mail not sending - this works for me...

I have what seems to be an increasingly common problem with Mail in SL. Suddenly not sending. I've read all the advice, which is great and helpful, but the problem here is that this is suddenly happening. No change to any settings, ISP has no problem with the port, I can send from a Mac Pro running Leopard. What seems to work (don't ask me why) is shutting down Mail for at least a minute. I know it makes no sense, and it's doubly annoying, because [it appears] that solutions to problems with Macs are getting closer to the old solutions for wintel - shut down, restart and hope. If possible, sacrifice a chicken simultaneously.
Shame. I was enjoying the Mac experience!

I don't have any problem sending, and using several different SMTP.
If this is only with your laptop, I suspect that in moving from place to place and likely using the Default Port list for the SMTP that it is getting switched from time to time between ports in the list, and not finding the right one sometimes.
If you have a SMTP that will work on, say Port 587 or 465, and never need Port 25, change to Use Custom Port and directly enter the needed port, rather than use the Default list. If, however, your home venue requires Port 25, but moving about requires one of the others, then not a good workaround.
Ernie

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