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We get this message a couple of days later..
Delay reason: SMTP error from remote mail server after pipelined MAIL FROM:<blah blah.co.uk SIZE=7004:
421-Too many messages (1.5.7.2) on 2020/09/06 18:35:36 BST from un-validated IP address:
35.208.156.208. Please add a SPF record for the domain blah blah.co.uk to your DNS or ask your service provider to do this,
421 we will be unable to deliver email until this is done due to the volume of email being sent from this IP address. An SPF record allows us to verify you and confidently deliver your email to our customers. Our Postmaster will be unable to help you.
What does this mean, how do we fix it?
The email address is hosted on site ground.
Please type clearly and slowly , as I’m an idiot when it comes to tech.
https://www.dmarcanalyzer.com/spf/
Whats the domain name you are attempting to send FROM? ie whats the bit after the @ of your email address?
Please add a SPF record for the domain
do that.
or ask whoever did your website to do it.
The SPF record bit is basically asking you (or your service provider) to whitelist the IP addresses or domain names of your company/site. It's a simple means of saying "this computer is allowed to send emails on our behalf".
The "volume of email" bit suggests that spammers are using your address as a relay or forwarding post.
The “volume of email” bit suggests that spammers are using your address as a relay or forwarding post.
Not quite. It suggests that they're seeing a lot of email from the same server that you are using, which isn't surprising as presumably it's shared with lots of other siteground customers.
Without SPF, you'll also find that your email to GMail addresses is ending up spam folders.
We probably send 5 emails a day .
Yeah, as above, it's not you, it's all the other customers using the same server.
Without SPF, a lot of your mail won't get through, it's just that BT have actually rejected it properly rather than just quietly sticking it in a spam folder.
I knew this was going to be an SPF issue or something very similar before I opened the thread.
Whoever maintains the DNS records for blahblah.co.uk will have to add an SPF entry into the DNS table. This is a TXT entry which essentially says "these IP addresses are my mail server, so any mail NOT sent from those addresses should be treated with suspicion / binned."
This was a pain in the 'arris particularly with BT back when I was responsible for MXes like 15-20 years ago, they were forever moving the goalposts. They were absolutely right to do so of course, but it caused murders because of course everything is our fault.
The IP address the mails are from, 35.208.156.208, resolves as Google cloud, so there will indeed be a lot of emails. As said, you need to follow the instructions in bigyan's link.
As an aside, if posting to ask for help on problems with emails or other internet traffic, if you quote a domain, say what it is, don't change it to blahblah.co.uk - you're not hiding anything sensitive, just making it harder for people to help you. You can hide the bit before the @ , just use the proper domain.