Anyway to get SS to use SMTP server instead of using PHP mailer?
I'm using Userforms the old mod for this looks out of date for 3.+ use
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Mail functionality hasn't really changed 2.* to 3.*, it will change in the next major release (replaced with a better mail implementation) but your SMTP customisations should mostly work.
I use https://github.com/xeraa/silverstripe-smtp (with some mods around attachments)