553 Error

[YorkieDom]

Hi, I am also having a problem sending an email. There are some attachments. I have reduced the number of recipients to 1 (from 4) and changed the subject heading several times. Help please!

Dominic

[NeilO]

Hi, @YorkieDom welcome to the community and thanks for posting, I'm sorry to see you're having problems sending emails at the moment. 

The 553 error means our spam filters are stopping the email from being sent and one thing to check would be a blocklisted IP. Are you currently in the UK or do you use a VPN to change your geolocation? 

If you enter your IP address into this checker https://mxtoolbox.com/blacklists.aspx does it show that it's listed?

Thanks

Neil

[B-L2]

I've had this problem a couple of times and have found it just disappears of its own accord after a day or two!

Which doesn't make it any less of a nuisance at the time, of course.

[YorkieDom]

Hi Neil. Thanks for the reply.

I am in the UK and don't use a VPN.

I've run the checker on my IP address and it says 'Blacklisting isn't the only email delivery issue' then wants me to sign up to something.

Thanks

[NeilO]

Hi @YorkieDom Ignore the advertising bar at the top of the page, what does it say immediately below that? If your IP is listed it will tell you below the advert. Are there any red X's with listed beside them?

Thanks

Neil

[YorkieDom]

I've just copied and pasted the result:

reverse lookup

smtp diag

subnet tool

Reported by mxtoolbox.com on 11/9/2021 at 5:38:40 AM, just for you.  Transcript

blacklist: XXX.XXX.X.XXX    Solve Email Delivery Problems

 blacklist

No red X anywhere.

Thanks. Especially for warning about the advert.

[NeilO]

@YorkieDom Thanks for confirming that, we can raise this with email experts to check the server logs to find out what's going on and I'll send you a private message so you can get in touch with the moderation team.

Thanks

Neil