This topic

SMTP slow after changing Broadband speed/provider

David_W102 — Wed, 13 May 2026 07:16:14 GMT

Yes - I'm having real problems here with my new 900mbps service and sending (SMTP) bt emails - Did anybody see a way out of this.

[Mod edit: updated title]

Re: SMTP stopped working after changing Broadband speed

Peter_W — Fri, 17 Apr 2026 09:47:11 GMT

Good morning @David_W102.

Just to double check, which client are you normally using to send, and do you get the same issues if you try BT Webmail?

Also is your 900 Mbps service on BT, EE, Plusnet, or another ISP?

Peter

Re: SMTP stopped working after changing Broadband speed

David_W102 — Fri, 17 Apr 2026 10:42:00 GMT

Hi Peter...

So in answer to your questions:

Which client are you normally using to send: I normally use Thunderbird, But have also tried Outlook 2024. Both appear to be either not working or as I have noticed today , working but very slow to process a sent message.

Do you get the same issues if you try BT Webmail? : No - If I use a web based app I don't see a problem, messages get sent fine.

Also is your 900 Mbps service on BT, EE, Plusnet, or another ISP? I was using TalkTalk (FTTC) until recently. With them emails were sending fine. I have noticed the issue now I have moved to Full fibre with Toob.com. But this could just be a coincidence as overall I have found the Toob service to be working well re general web based working.

Thanks

David

Re: SMTP stopped working after changing Broadband speed

licquorice — Fri, 17 Apr 2026 13:46:01 GMT

I suspect Toob IP address pool is the problem here, there are other posts from Toob customers having mail problems.

Re: SMTP stopped working after changing Broadband speed

David_W102 — Fri, 17 Apr 2026 13:48:08 GMT

Yes, I'm of the opinion that it must be something with Toob..

Re: SMTP stopped working after changing Broadband speed

Peter_W — Fri, 17 Apr 2026 14:23:06 GMT

Thanks @David_W102.

Whilst there's a fair chance it could be something at our end, I've still flagged this with our team so we can double check everything at our end too.

If I require any further details or get any updates I'll be sure to let you know, too!

Peter

Re: SMTP stopped working after changing Broadband speed

David_W102 — Sun, 19 Apr 2026 11:30:58 GMT

Thanks for that - Toob have closed the tickets I had open re this issue. But emails are still processing very slowly. Would appreciate any further checks BT server-wise ??

Slow emails / Full Fibre

David_W102 — Tue, 12 May 2026 17:11:26 GMT

Hi - I'm not currently with BT Fibre but am with a co called Toob. I do have a premium email account with BT though.

For a while I was with TalkTalk (FTTC) which worked fine with my BT email service. So recently I moved to Toob for their Full Fibre service which works great but I have noticed that emails sent (SMTP) are taking a while to process and send. Receiving emails is fine. I haven't changed any of the settings on my email client (Thunderbird, but have also tried Outlook).

Tests using a web based client are fine with emails sending immediatly. I have also removed the Toob router and fibre connection and used a mobile phone hotspot which again was fine with emails being sent immediatly.

Wonder whether anybdy has come across this weirdness...

Re: Slow emails / Full Fibre

licquorice — Tue, 12 May 2026 17:22:57 GMT

Obviously a problem with Toob's IP address pool.

Re: Slow emails / Full Fibre

David_W102 — Tue, 12 May 2026 17:38:07 GMT

Thanks, I did try doing some checks , openssl s_client, which appeared to indicate everything was OK.

Re: Slow emails / Full Fibre

licquorice — Wed, 13 May 2026 07:22:34 GMT

You received the same reply on this thread.

Re: Slow emails / Full Fibre

David_W102 — Wed, 13 May 2026 15:52:00 GMT

How do I get them to do anything about their IP address pool ?

Re: Slow emails / Full Fibre

licquorice — Wed, 13 May 2026 16:00:19 GMT

Talk to TOOB, nothing to do with BT.

Re: Slow emails / Full Fibre

David_W102 — Wed, 13 May 2026 16:08:56 GMT

They say its BT !

Re: Slow emails / Full Fibre

licquorice — Wed, 13 May 2026 16:19:26 GMT

Of course they do.