The error is -- The following message to <brian(a)bkantor.net> was undeliverable. The reason for the problem: 5.3.0 - Other mail system problem 550-'5.7.1 Disposition Notification Denied:NOYGDB' -- Even when mailing to your @ucsd.edu address 73, Ruben - ON3RVH -----Original Message----- From: Ruben ON3RVH Sent: vrijdag 29 maart 2019 8:22 To: 'Brian Kantor' <Brian(a)bkantor.net>et>; AMPRNet working group <44net(a)mailman.ampr.org> Subject: RE: [44net] Brian Kantor could you contact me off-list please Even that is failing for some reason. Afaik my SPF records are correct and my mailbox is on o365.. 73, Ruben - ON3RVH -----Original Message----- From: Brian Kantor <Brian(a)bkantor.net> Sent: vrijdag 29 maart 2019 8:18 To: AMPRNet working group <44net(a)mailman.ampr.org> Cc: Ruben ON3RVH <on3rvh(a)on3rvh.be> Subject: Re: [44net] Brian Kantor could you contact me off-list please bkantor.net isn't an O365 mailbox, so I don't know why it's bouncing the way you say it is. Try brian(a)ucsd.edu and see if that works. - Brian On Fri, Mar 29, 2019 at 07:10:58AM +0000, Ruben ON3RVH wrote:

Yeah, I have the "read notification" on. Standard thing that I set on my mails to customers to know that they've read my mail. Disabled it and sent another mail, doesn't seem that one gets rejected for now :) Thanks! 73, Ruben - ON3RVH -----Original Message----- From: 44Net <44net-bounces+on3rvh=on3rvh.be(a)mailman.ampr.org> On Behalf Of Brian Kantor Sent: vrijdag 29 maart 2019 8:32 To: AMPRNet working group <44net(a)mailman.ampr.org> Subject: Re: [44net] Brian Kantor could you contact me off-list please Oh, I see. The mail you are trying to deliver to me has a "Disposition Notification To" header line in it. This is a common trick used by spammers to prospect for valid mailboxes, because its purpose is to send the message sender an acknowledgement as soon as the message is opened by the recipient, whether the recipient wants to tell you that they've looked at your message or not. I don't allow mail wanting those acknowledgement messages because I believe they are a privacy violation, so yours is getting rejected. Delete that line from your email header and you'll get through just fine. - Brian On Fri, Mar 29, 2019 at 12:18:17AM -0700, Brian Kantor wrote: _________________________________________ 44Net mailing list 44Net(a)mailman.ampr.org https://mailman.ampr.org/mailman/listinfo/44net

Just curious, but don't e-mail clients ask you whether you want to send the acknowledgement or not? I know Thunderbird asks. Ron W6RZ On 3/29/19 00:31, Brian Kantor wrote:

Wow. Today I learned. What does that header look like? Ron W6RZ On 3/29/19 01:15, Ruben ON3RVH wrote:

Some do, like Thunderbird. Some don't, I'm told. The particular client I usually use, 'mutt', doesn't respond to them at all. (Yes, it's a crusade. One of the very few principles of mine that the modern internet hasn't destroyed yet.) - Brian On Fri, Mar 29, 2019 at 01:07:09AM -0700, Ron Economos via 44Net wrote: