Emails from Sendgrid do not reach our emails unless sent to onmicrosoft.com domain

[user2439]

What is the name of the domain?

Home Page | The Tara Group

What is the error number?

No error on our end

What is the error message?

The tara-group.co.uk server blocked this message from being delivered. While we won’t try to send this message again, we will attempt to send new messages to this address in the future.

What is the issue you’re encountering

Emails from Sendgrid do not reach our emails unless sent to onmicrosoft.com domain. Nobody within our organisation is able to receive emails sent using Sendgrid (being sent from a different company to us) and it’s not showing up in anything on our end at all. The only time it worked was when they sent it to our @taragroupcouk.onmicrosoft.com domain. According to them, nobody else has the issue and all receive emails fine, and we also receive emails from everyone else fine.

What steps have you taken to resolve the issue?

I have looked in 365 and Proofpoint for any record of the email sent from them and there is absolutely nothing. I saw that a possible issue may be the DNS record for the email being proxied but it didn’t seem to be the case as it was not proxied.

What are the steps to reproduce the issue?

I contact the external company and ask them to send me another email through that method.

[DarkDeviL]

@user2439

tara-group.co.uk

That domain is having two SPF records.

$ dig +noall +answer TXT tara-group.co.uk | grep spf
tara-group.co.uk.       300     IN      TXT     "v=spf1 include:spf-006c2501.pphosted.com include:gatormail.co.uk include:spf.protection.outlook.com -all"
tara-group.co.uk.       300     IN      TXT     "v=spf1 include:spf2.accessacloud.com ~all"

You need to figure out whether you actually need “include:spf2.accessacloud.com” or not, as well as any other mechnaism you have in your SPF record, and if not, the clean up your SPF record, by removing any obsolete entries from it.

If you do actually need them all, then merge them together in to one, e.g.:

v=spf1 include:spf-006c2501.pphosted.com include:gatormail.co.uk include:spf.protection.outlook.com include:spf2.accessacloud.com -all

If that SPF record fix doesn’t solve your problem, then you will need to contact your email providers (e.g. SendGrid and MIcrosoft Office 365) for further assistance.