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PennyH
Level 2
August 14, 2025
Solved

Deliverability issues / Post Master Tools

  • August 14, 2025
  • 1 reply
  • 551 views

Hello

We are experiencing deliverability issues, we saw a huge soft bounce jump, its mainly affecting Yahoo, Aol & Sky.

The soft bounce information mainly seems to be:

554 5.4.7 [internal] (last transfail: 421 4.7.0 [TSS04] Messages from 185.28.196.47 temporarily deferred due to unexpected volume or user complaints - 4.16.55.1; see https://postmaster.yahooinc.com/error-codes)

We have not identified exactly why this has happened but can see potential contributing factors.

For now, we are suppressing these domains, but we need to overcome this issue.

I have seen that there is a Yahoo sender hub, which may give me more insights.  But it’s asking for me to add a TXT code to our domain:

After your domain’s DNS configuration has been updated with its TXT record, you can complete the verification process.

Has anyone done this? I am unsure if it will cause any issues for me to add their TXT code to the TXT Value in the email domain area in Marketo?

Any help would be appreciated . Thank you

Best answer by Chargotra

I would suggest adding the TXT record in your DNS provider’s settings, not inside Marketo’s “Email Domain” field; that field is for authentication keys (such as DKIM), not postmaster verification.

1 reply

C
ChargotraAccepted solution
Level 2
August 14, 2025

I would suggest adding the TXT record in your DNS provider’s settings, not inside Marketo’s “Email Domain” field; that field is for authentication keys (such as DKIM), not postmaster verification.

P
PennyHAuthor
Level 2
August 14, 2025

Thanks for commenting, I will see if that is possible 

SanfordWhiteman
SanfordWhiteman
Level 10
August 14, 2025

Would think if your IT team is interested in helping, they’ll make this very easy & harmless addition to your DNS zone.

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