Re: [mailop] Anyone from Yahoo?

On 2024-03-05 at 18:12:05 UTC-0500 (Tue, 5 Mar 2024 19:12:05 -0400) Thomas Johnson via mailop is rumored to have said: Hello everyone- We had an incident where a trusted connection from Microsoft had a nice large dump of spam - it appears that several of their customers were compromised.

[mailop] Anyone from Yahoo?

Hello everyone- We had an incident where a trusted connection from Microsoft had a nice large dump of spam - it appears that several of their customers were compromised. We've stopped it, and we're sure it's not going to happen again, but yahoo has listed our IP address blocks with a dreaded

[mailop] Anyone from Yahoo/ATT ?

Hi, We are having emails from our cloud service going directly to the SPAM folder in Yahoo/ATT. SPF/DKIM/DMARC show pass in the message Is there someone we can connect with to understand why and correct? Thanks! Graeme Email secured by Trustwave advanced threat protection. Learn more at

[mailop] Anyone from Yahoo?

Hello,One of my clients is experiencing some issues with sending emails to Yahoo/AOL -Their outgoing emails are headed via unifiedlayer servers (which I know, is the worst), but need further to debug this issue.Here's the bounce/ coming directly from UnifiedLayer:This is the mail system at host

[mailop] Anyone from Yahoo! on the line?

Hey Anyone from Yahoo! on the line who could help me with a deliverability issue? Pls reply off list :-) Kind Regards, Sidsel Jensen Team manager Mail & Abuse, Systems Engineer @ One.com s...@one.com signature.asc Description: Message signed with

[mailop] Anyone from Yahoo willing to help with a bounce issue?

Hey everyone, Is there anyone from Yahoo here that would mind helping me with some weird bounce issues we recently started seeing? Thank you, Zach Sverdrup [/Users/zachary.sverdrup/Library/Group Containers/UBF8T346G9.Office/TemporaryItems/msohtmlclip/clip_image002.png]

Re: [mailop] Anyone from Yahoo ?

PH01 means they think it’s phishing email. Are you publishing DMARC? laura > On May 9, 2018, at 9:49 PM, Vaibhav wrote: > > Hi Everyone, > > Anyone from Yahoo over here ? We are facing blocking at Yahoo for one of our > Banking domain where we tried to reach out

Re: [mailop] Anyone from Yahoo ?

Observe what issue?  Looks like a block that is still in place so you need to reach out to Yahoo. From: mailop <mailop-boun...@mailop.org> on behalf of Vaibhav <v.kulawade...@gmail.com> Date: Thursday, 10 May 2018 at 10:24 AM To: <mailop@mailop.org> Subject: [mailop]

[mailop] Anyone from Yahoo ?

Hi Everyone, Anyone from Yahoo over here ? We are facing blocking at Yahoo for one of our Banking domain where we tried to reach out yahoo postmaster team. As per postmaster they have resolve the issue but we are still unable to delivery email. We are getting below SMTP error code. We tried to

Re: [mailop] Anyone from Yahoo regarding "lost connection while sending RCPT TO" ?

--- > > Message: 1 > Date: Wed, 20 Dec 2017 12:36:10 +0100 > From: Bressier Simon <bressie...@gmail.com> > To: mailop <mailop@mailop.org> > Subject: [mailop] Anyone from Yahoo regarding "lost connection while > sendi

[mailop] Anyone from Yahoo regarding "lost connection while sending RCPT TO" ?

Hey all ! Have you already faced that issue from Yahoo on some IPs, and know why ? For now, we don't have any info from Yahoo's support (if someone from Yahoo is here btw ?) *4.4.2 delivery temporarily suspended: lost connection with > mta5.am0.yahoodns.net

Re: [mailop] Anyone from Yahoo - icmpv6 filtering breaks login.yahoo.com MTU detection

It is also common when people convert their ACL from IPv4 to IPv6 to forget to add a rule of PTB in their IPv6 ACLs... I would also suggest to use tracepath(6) for debugging, as it factors the port you want to reach and will try to detect the pmtu. You may find where the packet gets dropped this

Re: [mailop] Anyone from Yahoo - icmpv6 filtering breaks login.yahoo.com MTU detection

This problem is neither new nor specific to Yahoo or IPv6 and is usually referred as "blackhole router". ICMPv4 "Fragmentation Needed" (type 3 code4) / ICMPv6 "Packet to Big" (type 2) *are required* for path MTU discovery and should never be filtered. The only reason it doesn't strike you with

Re: [mailop] Anyone from Yahoo - icmpv6 filtering breaks login.yahoo.com MTU detection

On Sat, 19 Nov 2016 08:33:27 -0800, Carl Byington said: > Of the 220 sites identified above, 218 of them manage to see the icmpv6 > packet and respond by resending with a packet that makes it thru the > tunnel. I suspect that packets from at least one of those 218 sites goes > thru many of the

Re: [mailop] Anyone from Yahoo - icmpv6 filtering breaks login.yahoo.com MTU detection

-BEGIN PGP SIGNED MESSAGE- Hash: SHA512 On Fri, 2016-11-18 at 16:52 -0500, valdis.kletni...@vt.edu wrote: > And you identified that the problem was at Yahoo, and not one or more > of the hops between the far end of your tunnel and Yahoo, how, > exactly? Taking the top 1000 sites from

Re: [mailop] Anyone from Yahoo - icmpv6 filtering breaks login.yahoo.com MTU detection

On Fri, Nov 18, 2016 at 01:01:50PM -0800, Carl Byington wrote: > On Fri, 2016-11-18 at 15:41 -0500, valdis.kletni...@vt.edu wrote: > > > Did you do anything to specifically identify Yahoo's routers as the > > offenders? > > > Hint: If there's a tunnel in the path, it will be *your* end of the >

Re: [mailop] Anyone from Yahoo - icmpv6 filtering breaks login.yahoo.com MTU detection

On Fri, 18 Nov 2016 13:01:50 -0800, Carl Byington said: > response to that will be a bunch of full size packets from Yahoo with > the certificate, etc. The *far* end of my tunnel will be sending the > icmpv6 "packet too big" back to Yahoo. And you identified that the problem was at Yahoo, and

Re: [mailop] Anyone from Yahoo - icmpv6 filtering breaks login.yahoo.com MTU detection

-BEGIN PGP SIGNED MESSAGE- Hash: SHA512 On Fri, 2016-11-18 at 15:41 -0500, valdis.kletni...@vt.edu wrote: > Did you do anything to specifically identify Yahoo's routers as the > offenders? > Hint: If there's a tunnel in the path, it will be *your* end of the > tunnel > that sends back

Re: [mailop] Anyone from Yahoo - icmpv6 filtering breaks login.yahoo.com MTU detection

Hi Carl, Could you please send me IPv6 traceroutes to the Yahoo server(s) in question? I'll have someone take a look. -MJ On Fri, Nov 18, 2016 at 11:58 AM, Carl Byington wrote: > -BEGIN PGP SIGNED MESSAGE- > Hash: SHA512 > > https://login.yahoo.com > > If you

Re: [mailop] Anyone from Yahoo - icmpv6 filtering breaks login.yahoo.com MTU detection

On Fri, 18 Nov 2016 11:58:58 -0800, Carl Byington said: > If you have IPv6 connectivity thru a tunnel, with a smaller MTU, that > will fail. With a 1500 byte MTU, it works. The TCP handshake works - it > then hangs during the TLS handshake which sends full size packets. Did you do anything to

[mailop] Anyone from Yahoo - icmpv6 filtering breaks login.yahoo.com MTU detection

-BEGIN PGP SIGNED MESSAGE- Hash: SHA512 https://login.yahoo.com If you have IPv6 connectivity thru a tunnel, with a smaller MTU, that will fail. With a 1500 byte MTU, it works. The TCP handshake works - it then hangs during the TLS handshake which sends full size packets. echo -e 'GET /