My apologies as the email had a typo of the domain in the subject and body.
I did send my email to [email protected] (as noted in the bounce).

Justin

On Tue, Oct 24, 2023 at 12:20 AM Justin Frechette <
[email protected]> wrote:

> AT&T,
>
> I am unable to send email to [email protected] for blocklist
> mitigation. It worked Friday but attempts today are failing. If possible,
> could you please review the following IPs for blocklist removal for breach
> notifications?
>
> 74.202.227.59
> 74.202.227.60
> 74.202.227.61
>
> Thank you,
> Justin Frechette
> iContact
>
> The original message was received at Tue, 24 Oct 2023 00:13:50 -0400
> from mlpi433.enaf.sfdc.sbc.com [144.160.20.149]
>
>    ----- The following addresses had permanent fatal errors -----
> <[email protected]>
>     (reason: 550 5.1.1 <[email protected]>: Recipient address
> rejected: User unknown in local recipient table)
>
>    ----- Transcript of session follows -----
> ... while talking to a51-eastus2-prod-mtavm.az.3pc.att.com.:
> >>> DATA
> <<< 550 5.1.1 <[email protected]>: Recipient address rejected: User
> unknown in local recipient table
> 550 5.1.1 <[email protected]>... User unknown
> <<< 554 5.5.1 Error: no valid recipients
>
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