How to avoid SMTP server blocking?
We have 600+ subscribers and notification mails are bouncing hard. Most of them are blocked by server’s firewall.
550 relay not permitted (in reply to RCPT TO command)
SMTP error from remote mail server after end of data: 550 5.7.1 [TCR] Generating too many errors with receivers
I was told by the ISP that I need to slow down the sending rate. Is there any plugin for this? If bbPress Notify (No Spam) is the only one then I need to pay for the subscription for the Private Group Bridge add-on, which I would like to avoid since this site is non-profit and I am paying everything from my pocket. Hope there is another solution.
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