Suddenly I Can't Send E-mails

[#1]

Well I can send them, but only between my own two e-mail addresses. In all other cases I receive the error message:
"

This is an automatically generated Delivery Status Notification.      

Delivery to the following recipients failed permanently:

   * johnsmith@bmail.com

Reason: A message that you sent to the following recipient could not be delivered due to a permanent error. ** The remote server ?? responded with: **

johnsmith@bmail.com

??:?? This message was created automatically by mail delivery software on the server .

Reporting-MTA: dns; avasout-ptp-003 [84.93.230.244]
Received-From-MTA: dns; [192.168.1.8] [91.125.88.220]
Arrival-Date: Sun, 02 Jul 2023 23:42:50 +0100


Final-recipient: rfc822;

johnsmith@bmail.com

Diagnostic-Code: smtp; 550-5.7.26 This mail is unauthenticated, which poses a security risk to the Last-attempt-Date: Sun, 02 Jul 2023 23:42:51 +0100".

I've been using Plusnet for several years without problem until this occurred and I'm pretty ignorant about such things. Any ideas, please?

By the way, after I attempted to post this message Plusnet responded with "Your post has been changed because invalid HTML was found in the message body. The invalid HTML has been removed. Please review the message and submit the message when you are satisfied." I'm clueless as to what that means.

[#2]

Are the rejections when trying to send to gmail addresses ?

The rejection code 550-5.7.26 is gmail asserting that the email must be authenticated by either SPF and/or DKIM.

Are you sending from a <account>.plus.com address or do you have your own domain ?

You might want to start by reading this thread https://community.plus.net/t5/Email/Mail-bouncing-to-gmail/m-p/1906796#M41931 for some background information

[#3]

Thanks for your reply.

I hadn't noticed it until you mentioned it, but all the addresses in question are indeed gmail ones.

I have my own domain.

Thanks for the link. I'll study that and with any amount of luck I might be able to understand a little of it!

[#4]

I've had a look at that link now, and while most of it went straight over my head I gather that it's a gmail problem and that I need to change my Plusnet settings to solve the problem.

On 25-01-2023 Townman posted what looks like useful advice, i.e. go to Manage Account -> Manage Your Domains. However, under Manage Account I can't see "Manage Your Domains", so I'm rather stuck.

[#5]

Is your domain actually hosted by Plusnet ?

[#6]

Deleted - hadn't spotted 'have my own domain' earlier.

[#7]

Oh Gawd, we're getting onto the technical stuff now. How can I find out? A techno-wizz friend of mine set the domain up for me several years ago so that I could keep my two e-mail addresses if I ever changed my Internet provider. I pay him a small rental each month for the domain. Does that help?

[#8]

I send from myname@myaccount.co.uk, not from myaccount.plus.com.

[#9]

A techno-wizz friend of mine set the domain up for me several years ago so that I could keep my two e-mail addresses if I ever changed my Internet provider. I pay him a small rental each month for the domain. Does that help?

A little!. I would guess that your domain is NOT hosted by Plusnet. Rather its registered somewhere else and you use that registrars basic email forwarding service.

I'm afraid you need to get hold of your friend and inform them that they need to add an SPF record to your domain to specify the Plusnet mail servers as permitted senders for your domain. If they don't understand, then I'm afraid they're not as techno-wizz as you believe!!

Note , there's nothing you can do on your Plusnet account to fix this, it has to be done on the domain configuration.

[#10]

@Ianda 

If you want to know the registrar for your domain (that’s the bit after the @ in your email address), then enter it in here: https://who.is

[#11]

Thanks, Folks. I'm learning all the time!  (You learn something new every day; then you die and forget the lot.)

My technopal is going to get back to me later. In the meantime it appears that the registrar for my domain is 

Fasthosts Internet Ltd 

[#12]

@Ianda assuming you only send email using the Plusnet servers ( relay.plus.net ) then you need your technopal to add the following SPF record to your domain using the Fasthosts control panel

v=spf1 a mx include:_spf-internal.plus.net include:_spf-internal2.plus.net ~all

[#13]

Thanks again. I'll be sure to tell him.

[#14]

Thanks to everyone here for your assistance. My Technopal made some adjustments, and I can now send and receive emails to and from gmail addresses, both from my PCs and my iPhone. Excellent!