[mailop] Microsoft/O365 SPF failures

Hi, since several weeks I see more and more SPF-Errors for mails coming from O365. It seems that when mails gets relayed, they use outbound mail servers that are not valid for sending from the (relaying, not origin) mail address. My O365 account where I have relaying active is an academic account

Re: [mailop] Microsoft/O365 SPF failures

That is intentional/by design. The source is inside 40.95.0.0/16 which is their "relay pool". It is documented here - https://docs.microsoft.com/microsoft-365/security/office-365-security/high-risk-delivery-pool-for-outbound-messages. Scroll down to the relay pool subheader and read up more ab

[mailop] Anyone from United Airlines ?

Hi, Emails from united are getting rejected by our postfix mailserver. The mails seem to be from United Airlines (Mileage Plus). Jan 20 19:16:45 mta01 postfix/postscreen[126746]: CONNECT from [50.31.61.242]:47664 to [xxx.xxx.xxx.xxx]:25 Jan 20 19:16:45 mta01 postfix/postscreen[126746]: WHITELIS

[mailop] Anyone from United Airlines ?

Hi, Emails from united are getting rejected by our postfix mailserver. The mails seem to be from United Airlines (Mileage Plus). Jan 20 19:16:45 mta01 postfix/postscreen[126746]: CONNECT from [50.31.61.242]:47664 to [xxx.xxx.xxx.xxx]:25 Jan 20 19:16:45 mta01 postfix/postscreen[126746]: WHITELIS

Re: [mailop] Anyone from United Airlines ?

That looks like Sendgrid, so they may be able to ping United. I have the contact of their CTO, but you may get quicker help from SendGrid. On 1/20/22 2:04 PM, Glowfish Domainadministrator via mailop wrote: Hi, Emails from united are getting rejected by our postfix mailserver. The mails see

Re: [mailop] Microsoft/O365 SPF failures

Hi, thanks for the info. Am Do den 20. Jan 2022 um 19:52 schrieb joemai...@nym.hush.com: > That is intentional/by design. > > The source is inside 40.95.0.0/16 which is their "relay pool". It is > documented here - > https://docs.microsoft.com/microsoft-365/security/office-365-security/high-ris

[mailop] Anyone from Sendgrid or Twilio on this list?

I’m getting a complaint from a customer that they aren’t receiving emails from their Moultrie game camera when sent to their Eastex.net email address. As a test, the customer switched it to send to their Yahoo account and they receive the messages without issues. I’m fairl

Re: [mailop] Anyone from Sendgrid or Twilio on this list?

Am 20.01.22 um 20:37 schrieb Mike McTee via mailop: I’m getting a complaint from a customer that they aren’t receiving emails from their Moultrie game camera when sent to their Eastex.net  email address.  As a test, the customer switched it to send to their Yahoo account and t

Re: [mailop] Anyone from United Airlines ?

For the record, in practice it is TOO limiting to expect both forward and reverse match, and especially if your system doesn't look at multiple records correctly, eg ANY A <> ANY PTR should be enough. But expect a lot of false positives if trying to get them to match in any case. As long as t

Re: [mailop] Anyone from United Airlines ?

On 2022-01-20 at 14:04:36 UTC-0500 (Thu, 20 Jan 2022 19:04:36 +) Glowfish Domainadministrator via mailop is rumored to have said: > Hi, > > Emails from united are getting rejected by our postfix mailserver. The mails > seem to be from United Airlines (Mileage Plus). [...] > Jan 20 19:16:47 m

Re: [mailop] Anyone from Sendgrid or Twilio on this list?

> I’ve gotten the header from the successful test that our customer sent to his > Yahoo account, but the IP Addresses gathered there didn’t appear in any of > our servers logs either. Are they not either of the two you mentioned? -- Atro Tossavainen, Chairman of the Board Infinite Mho Oy, Hels

Re: [mailop] Anyone from United Airlines ?

Thanks Bill for the clarification as well as the offered solution 😊 -Ursprüngliche Nachricht- Von: mailop Im Auftrag von Bill Cole via mailop Gesendet: Donnerstag, 20. Januar 2022 21:17 An: Glowfish Domainadministrator via mailop Cc: Bill Cole Betreff: Re: [mailop] Anyone from United Ai

Re: [mailop] Anyone from Sendgrid or Twilio on this list?

Happy to chat offline about this. The mail they are attempting to send to eastex.net is exclusively going to one address. This address returned *550 5.1.1 > is not a valid mailbox* on December 23rd, 2021. After we receive a response like that, we add the address to the sender's suppression list. Th

Re: [mailop] [EXTERNAL] Re: Microsoft/Lindo - junked,not blocked

We check IP ranges. Aloha, Michael. -- Michael J Wise Microsoft Corporation| Spam Analysis "Your Spam Specimen Has Been Processed." Open a ticket for Hotmail ? -Original Message- From: mailop On Behalf Of Hans-Martin Mosner via mailop Sent: Monday, January 17, 2022 11:08 PM To: mailo

Re: [mailop] [EXTERNAL] Re: Microsoft/Lindo - junked,not blocked

That won't work for this kind of a block. There are two kinds ... ones where you can go to the page mentioned in the error response, and others that must be handled manually by sending a request to delist@, also mentioned in the error response. Aloha, Michael. -- Michael J Wise Microsoft Corpo

Re: [mailop] [EXTERNAL] Re: blocked by microsoft -- support procedure?

Step 0: Read the error message in the NDR. THEN... If it's Office365 (aka, "Enterprise"), and you're not currently an Office365 customer ... create a trial account (one mailbox, nothing special), send the email to that account, and when it bounces, open a support case. Also, if the error