That error message is not overly accurate in this case, unfortunately. The fact that it was a temp fail means its throttling, which can definitely happen when there is infrequent sending, so the behavior is "unusual"... it can be very common for a low to high sending change to be due to domain reaping on expiration, or compromise.
As for "maybe Google gets it wrong"... well, doh. Every spam result is potentially inaccurate, especially given the motto of spam being in the eye of the beholder, so no opinion is going to match multiple receivers 100%. The only thing you can do is statistical analysis to validate your effectiveness, but the laws of large numbers mean that even small failures can have a large effect... and the false positives are not equally distributed either. Brandon On Fri, Feb 24, 2023 at 8:20 AM Christine Borgia via mailop < mailop@mailop.org> wrote: > Hello! Long time no see. I have a customer whose email campaign was > heavily blocked yesterday by Gmail with the error: > > > 421 4.7.0 [149.72.90.158 15] Our system has detected that this message is > suspicious due to the very low reputation of the sending domain. To best > protect our users from spam, the message has been blocked. Please visit > https://support.google.com/mail/answer/188131 for more information. > v14-20020a05620a440e00b0073ba7884843si8095361qkp.8 - gsmtp > > I would love to speak to someone at Gmail about this because I don't think > the customer should have a very low reputation. Of course, I could be > wrong, and Gmail is seeing something I'm not seeing. The customer has > double opt-in, low complaints, good opens, lots of purchases, and an active > social media presence with a lot of followers/fans. I think the issue is > that they only send every couple of months. They are a fashion retailer > that announces their upcoming event via email (the email we saw blocked) > and their inventory sells out during the event. > > If someone could reach out to me, I'd greatly appreciate it. I'm not sure > what to advise this customer except to say that email may not work for > their business model. > > Thx! > > -- > *Christine Borgia* > Email Deliverability Manager > [image: Shopify] > <https://www.shopify.com/?utm_medium=salessignatures&utm_source=hs_email> > _______________________________________________ > mailop mailing list > mailop@mailop.org > https://list.mailop.org/listinfo/mailop >
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