Outgoing Emails Bouncing (Gmail)

[theereal]

So, our customer recieve their invoices every month through mail with an attached PDF. However, recently some of our customers have not recieved their email. This month only 2 out of 31 emails were sent successfully and i recieved an error from the Mail Delivery System for the remaining 29 emails. The error code is 550 5.7.1 and contains the following error message:

 

"A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:"

 

 example@gmail.com
    host gmail-smtp-in.l.google.com [**.***.***.**]
    SMTP error from remote mail server after end of data:
    550-5.7.1 [***.***.***.***] Messages missing a valid messageId header are not
    550 5.7.1 accepted. b40-20020a2ebc28000000b0025e52e7071fsi51343ljf.183 - gsmtp

 

 

This is what the original email looked like:

---------- Forwarded message ----------
From: "example@gmail.com" <example@gmail.com>
To: example@hotmail.com
Cc: example@hotmail.com
Bcc: 
Date: Sun, 31 Jul 2022 21:16:48 +0200
Subject: Faktura fra Nygårdsgaten Maling og Jernvare
Hei.

Vennligst se vedlagte faktura fra oss.

NB: Husk å bruk kidnummer 6 tall.

Med vennlig hilsen

Nygårdsgaten Maling og Jernvare AS

...

 

We are using a system called Athena to manage sending out our invoices every month. As far as i could tell there was no difference in the Athena system between the customers that did recieve the email and the ones that did not.

 

Any help would be greatly appriciated.

[Wolly9102]

49 minutes ago, theereal said:

So, our customer recieve their invoices every month through mail with an attached PDF. However, recently some of our customers have not recieved their email. This month only 2 out of 31 emails were sent successfully and i recieved an error from the Mail Delivery System for the remaining 29 emails. The error code is 550 5.7.1 and contains the following error message:

 

"A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:"

 

    host gmail-smtp-in.l.google.com [74.125.131.27]
    SMTP error from remote mail server after end of data:
    550-5.7.1 [] Messages missing a valid messageId header are not
    550 5.7.1 accepted. b40-20020a2ebc28000000b0025e52e7071fsi51343ljf.183 - gsmtp

 

 

This is what the original email looked like:

---------- Forwarded message ----------


Vennligst se vedlagte faktura fra oss.

NB: Husk å bruk kidnummer 6 tall.

Med vennlig hilsen

Nygårdsgaten Maling og Jernvare AS

...

 

We are using a system called Athena to manage sending out our invoices every month. As far as i could tell there was no difference in the Athena system between the customers that did recieve the email and the ones that did not.

 

Any help would be greatly appriciated.

First remove all sensitive information from your post. Would not be wise to leave it there. And then check if your domain is on a blacklist.

 

https://mxtoolbox.com/NetworkTools.aspx?tab=Email

[theereal]

16 minutes ago, Wolly9102 said:

First remove all sensitive information from your post. Would not be wise to leave it there. And then check if your domain is on a blacklist.

 

https://mxtoolbox.com/NetworkTools.aspx?tab=Email

Thanks for the reply  Haha, and yes good idea. Im slow, so i assume you meant enter the host IP adresses from here into the box that says "blacklist"? As far as i could tell neither is blacklisted when i put them in there.

[IkeaGnome]

18 minutes ago, Wolly9102 said:

First remove all sensitive information from your post. Would not be wise to leave it there. And then check if your domain is on a blacklist.

Don't forget to remove sensitive information from your quote

[theereal]

I did the "send an email test" and here are the results. It seems i am blacklisted. Is there a way to fix this? Im not very familiar with this stuff, its a part time job and once someone realized i liked computers, its obviously the assumption that i know everything about them and how to fix everything haha

[Wolly9102]

2 minutes ago, IkeaGnome said:

Don't forget to remove sensitive information from your quote

Done. Wasn't sure if it updated automatically from OP's post or not.

[Wolly9102]

53 minutes ago, theereal said:

I did the "send an email test" and here are the results. It seems i am blacklisted.

Usually there is an reason why you're blacklisted. Mass mailing can be automatically picked up as spam and you don't have an DKIM record. (Altrough I am no expert at this). I suggest you follow this guide on how to get whitelisted.

 

Then consider having a DKIM record for your gmail domain. Otherwise it will happen again.

 

https://kb.leaseweb.com/compliance-and-security/procedure-to-remove-blacklist 

 

[theereal]

7 minutes ago, Wolly9102 said:

Usually there is an reason your blacklisted. Mass mailing can be seen as spam and you don't have an DKIM record. (Altrough I am no expert at this). I suggest you follow this guide on how to get whitelisted.

 

https://kb.leaseweb.com/compliance-and-security/procedure-to-remove-blacklist 

 

Ok, thank you so much for the help  I will try this  Based on my post above, which of the IP adresses should i ask to be delisted?

[Wolly9102]

6 minutes ago, theereal said:

Ok, thank you so much for the help  I will try this  Based on my post above, which of the IP adresses should i ask to be delisted?

I don't think your IP is blacklisted. But the mailadress which you use to send your emails is.

[theereal]

9 minutes ago, Wolly9102 said:

I don't think your IP is blacklisted. But the mailadress which you use to send your emails is.

Ok, thank you so much for your help