Metronet email failure

[#1]

I have a similar looking issue to Tobiz yesterday: no emails received since 9.28pm Monday 17 March and I can't send emails. I have a MacBook with Mail and I get an error message: 'Mail can't verify the identity of the server "mail.metronet.co.uk" '. I've been with Metronet and then Plusnet for years and don't think anything has changed at my end. I can't send or receive emails on my iPhone either, so it looks to me like Plusnet have changed something. I can send and receive emails via webmail. I'd be grateful for some advice; I've read the posts on similar subjects but I'm not very techie. Any guidance would be much appreciated. Thanks!

[#2]

I also ended up with Plusnet having started ADSL with Metronet.

I don't think I ever had email with Metronet but it sounds like your account has lasted most of 20 years after Plusnet bought Metronet (and were then bought by BT),

You might find that using the Plusnet SMTP address would work

https://www.plus.net/help/archive/email/email-switch/

It doesn't mention Metronet but the Force9 instructions might work.

I might also think about migrating to another email supplier.

My top recommendation is Microsoft's Outlook (outlook.com) which would work OK with Mac mail but there is a standalone Outlook client for Macs.

Microsoft Outlook for Mac | Microsoft 365

Otherwise you probably have an iCloud account that does mail.

[#3]

The certificate issue reported is probably arising from setting SSL/TLS or STARTTLS encryption.  Try without encryption on port 25.