[Hidden-tech] Outlook Error Message

Sam McClellan sam at itabix.com
Thu May 28 12:39:35 UTC 2020

Hi Fred,

550 5.7.1 means that the client's spam protection rejected the email for 
some reason. You can contact the person either via phone/text or using a 
separate email account to let them know their system is rejecting your 


> The sender has probably landed on a third-party anti-spam product's 
> signature list. This may be caused by nonstandard email practices such 
> as a failure to audit mailing lists. Recipients of these email 
> messages have previously submitted those email messages as spam to 
> their anti-spam product vendor. The vendor then added an identifier 
> that's unique to the sender to its anti-spam definitions. It's this 
> identifier that's now blocking the email.
> Most frequently, the detection is triggered by something in the email 
> signature. This might be a URL, domain name, or telephone number.
> We recommend that you confirm the cause by sending a test email 
> message to the same recipient after you completely remove the 
> signature. If the email message is delivered without issue, you can 
> confirm that a component or characteristic of the signature is causing 
> the blocked email.


Sam McClellan
*Itabix, Inc*
/One place for all things Web/
sam at itabix.com
Main - 413.587.4600
Toll-free - 877-7ITABIX (877.748.2249)

On 5/27/2020 11:16 AM, Fred Levine via Hidden-discuss wrote:
> I’m wondering if anyone can shed light on this error message (Outlook 
> for Mac):
>  host mx2.hc3579-74.iphmx.com []
>     SMTP error from remote mail server after DATA:
>     550 #5.7.1 Your access to submit messages to this e-mail system 
> has been rejected
> I’ve sent multiple messages to the same address with no problem. 
> Suddenly they’re being rejected.
> Thanks,
> Fred
> Fred Levine
> Small Batch Books
> 493 S. Pleasant St.
> Amherst, MA 01002
> 413.230.3943
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