On 10/8/22 06:28, Robert Heller wrote:
Sometimes what happens is a mail provider like Yahoo (@yahoo.com, @aol.com, @verizon.net, and some others) or Microsoft (@hotmail.com, @outlook.com, others) and will greylist you and delay / defer E-Mail. You MTA will re-try every so often (every hour, 1/2 hour, etc.) for up to 5 days. Generally, eventually the mail gets through, but it could takes hours or days. There is not much you can do about this.
This is not the issue here. Here, the issue is in delivery from Mailman to the outgoing MTA (probably exim in the case of cPanel) and not in delivery from the MTA to the recipients.
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