I have a droplet setup using the LAMP by DigitalOcean OS Ubuntu 18.04 framework (which includes Postfix), and in testing out the php mail() function, I find that sending or cc’ing email to a Gmail address works perfectly. However if I try sending to my personal Fastmail account, OR a Yahoo account, the email never arrives. Seems that it’s only working with Gmail for some reason. The install is straight out of the box meaning I haven’t configured anything. Any ideas? -Thanks
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