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Double check that you have the correct SMTP server address and configured in your application or email client. Ensure the server address is spelled correctly. The error message indicates also a problem with DNS. IP address of SMTP server could not be resolved, may be check DNS configuration issues on your network or temporary DNS problem. SMTP server might be temporarily down, you can check if there is any of that issue. Finally, ensure that the SMTP server is listening to the correct port and that port is not blocked by your network or firewall. Hope it helps.
How do I ensure that the SMTP server is listening to the correct port and that port is not blocked by your network or firewall?
I went on my AWS Lightsail and updated the ports allowed by the firewall.
Furthermore, I have changed the email client to Outlook 365 (not AWS Workmail anymore).
My Wordpress website is now able to send emails but the email itself is not being delivered.
Could you guide me with detailed steps if possible?
Thank you so much for your help!
For your information, here are the following ports I have allowed for any IPv4 addresses : 22 25 80 110 143 443 587 993 995
Thanks!
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