[mailop] Air Canada sending from Adobe space failing to send to server with Let's Encrypt SSL certificate

This may be from Marketo or something? Whois shows Adobe with an ab...@marketo.com contact address. Oct 25 10:10:50 hyperion postfix/smtpd[1588023]: connect from r117.mail.aircanada.com[172.82.216.117] Oct 25 10:10:51 hyperion postfix/smtpd[1588023]: SSL_accept error from

Re: [mailop] .eml Attachments and the 1000-character SMTP Limit

On 12/10/2021 06:19, John via mailop wrote: > The answer is yes, it's not good practice to block messages containing long > lines in emails. That will likely cause problems at either the sender or > recipient. Senders may receive non-delivery notifications, recipients may > miss mails. > >

Re: [mailop] WhatCounts/Costco silliness

on Sun, Oct 24, 2021 at 09:33:15PM -0400, John R Levine via mailop wrote: > >>>List-Unsubscribe: > >>>List-Unsubscribe-Post: List-Unsubscribe=One-Click > >>> > >>>I don't know which fools to blame; The client Costco, or their ESP > >>>WhatCounts. Perhaps

Re: [mailop] WhatCounts/Costco silliness

> On 25 Oct 2021, at 02:33, John R Levine via mailop wrote: > List-Unsubscribe: List-Unsubscribe-Post: List-Unsubscribe=One-Click I don't know which fools to blame; The client Costco, or their ESP WhatCounts. Perhaps both. >>>

[mailop] Freemail.hu postmaster - I need your help

Hi all, I'm looking for a postmaster or email deliverability specialist from Freemail.hu. Is this professional here in this list as well? Does anyone know? Looking forward to hearing from you. Kind regards, Victor Roemgens Email Deliverability Specialist Harlem Next B.V.

Re: [mailop] .eml Attachments and the 1000-character SMTP Limit

> On 12 Oct 2021, at 07:19, John via mailop wrote: > > Hello Matt, > > The answer is yes, it's not good practice to block messages containing long > lines in emails. That will likely cause problems at either the sender or > recipient. Senders may receive non-delivery notifications,