PHPMailer::setFrom $auto should be FALSE by default about phpmailer HOT 3 CLOSED

I agree that it is unnecessary to set reply-to - it's only needed if it's different to the from address, yet here it's guaranteed to always be the same.
I'm not sure the same can be said for setting the sender.
As far as orthogonality goes, SetFrom is a convenience wrapper for setting From, FromName and Sender manually and having it do some other stuff automatically can make for simpler code overall. If you want finer control, you can always set them manually and just not call SetFrom.
In the same vein, I'm thinking of having MsgHTML normalize line breaks to CRLF; the vast majority of emails I see made with phpmailer use wrong line breaks to their detriment, so it would be consistent to have a convenience function do some cleaning up.

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I've removed the creation of the unnecessary reply-to, but I think setting Sender is generally a good idea, and it won't interfere with manual overrides, so I've kept that along with 'auto' mode. That ok with you?

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Yes that's great!

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