Member Avatar for snowwolf

I have set up a gmail pop in "mail" and hope I can receive and send the email by using "mail". It's fine when I get online in my home. But when I back to university, I try to send email by using "mail", it is not working anymore. Can someone give me some advise. Thank You for everyone

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Dani AI

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Good call by to ask for the final steps — resolved it and that detail can help others who see the same symptom: sending works on one network but fails on another. The most common causes are simple network rules or authentication mismatches rather than a Mail.app bug. Below are focused diagnostics and practical fixes to try when SMTP works at home but not on a campus or corporate network.

First, get concrete error text from Mail. Use Connection Doctor to test the outgoing server and copy any error lines; those messages tell whether the client is being blocked, rejected for auth, or failing SSL/TLS. Apple’s troubleshooting doc for Connection Doctor is useful: Use Connection Doctor in Mail on Mac. Also try webmail from the same network to confirm whether the account itself is OK.

If the campus or ISP blocks direct outbound SMTP, options are:

  • Use the network’s SMTP relay (contact IT) so Mail authenticates through the campus server.
  • Configure the client to use the provider’s recommended secure authentication (OAuth2 or an app password if two‑step verification is on). See Google’s official guidance for desktop clients: and .
  • As a fallback, use the provider’s web interface or an approved VPN/remote relay if allowed by policy.

Quick checklist: run Connection Doctor, try webmail and a phone hotspot to isolate the network, contact campus IT about SMTP restrictions, enable the provider-recommended authentication method, and avoid disabling encryption.

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Member Avatar for snowwolf

I am really sorry to brother yu all. I have find out the solution now. Would ppl delete this post plez. thanks alot

Member Avatar for kc0arf

Hello,

Instead of deleting the post, could we ask you to please type up what you did to fix the problem, so that the next person can give it a try to solve their issue?

Thanks.

Christian

Member Avatar for snowwolf

No problem, I had use the setting same as you can see in "gmail help". And the only thing I have changed is "server port" which is where

Mail>Preference>Accounts>Account Information>Server Setting>Server Port

I have used "25" instead using the suggestion from gmail help which is "587"

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