Zimbra smtp 25 port blocked by isp and he not give smtp relay for smtp authentication on 587 port

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abhishek_bhut
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Joined: Wed Nov 24, 2021 3:56 am

Zimbra smtp 25 port blocked by isp and he not give smtp relay for smtp authentication on 587 port

Postby abhishek_bhut » Wed Nov 24, 2021 4:19 am

Hello

Please help me my isp blocked 25 port and he not give me smtp relay and authentication details.
now i want to change me submission port to 587 without smtp relay and authentication.

it serious issue.please me as soon as possible.

send me answer on this email.
bhutabhishek63@gmail.com


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ianw1974
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Re: Zimbra smtp 25 port blocked by isp and he not give smtp relay for smtp authentication on 587 port

Postby ianw1974 » Wed Nov 24, 2021 7:49 pm

Hi,

If your ISP blocks port 25, then there are only two options. Either he gives you SMTP relay details so that you can send/receive emails. If not, then change ISP to an ISP that does give you SMTP relay ability. Or third option, get yourself a VPS at a hosting company like OVH, Linode, DigitalOcean, Vultr, etc, etc and install your mail server there.

You cannot send/receive emails between mail servers on port 587. Mail servers communicate on port 25. Port 587 is for email clients like Outlook, Thunderbird.

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