I know what #SMTP stands for since a loong time. However, for some reason I always hesitate between STMP and SMTP when writing/saying it out loud. Like, I have to say the whole name in my head to know which one is the correct one...
please tell me I'm not the only one 
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Continued thread
System Administration
Week 8, HTTPS & TLS
After discussing HTTP in the previous week and seeing how we used STARTTLS in the context of #SMTP, we are now quickly reviewing HTTPS, TLS, and the WebPKI. While we don't have a video segment for this, here are slides, including this handy diagram illustrating the CSR process:
MailChannels Acquires SMTP Protocol from IETF for $50 Million
https://www.linkedin.com/pulse/mailchannels-acquires-smtp-protocol-from-ietf-50-million-hbasc/
www.linkedin.comMailChannels Acquires SMTP Protocol from IETF for $50 MillionVancouver, BC — April 1, 2025 — In a shocking move that has rocked the email world, MailChannels announced today that it has acquired the Simple Mail Transfer Protocol (SMTP) from the Internet Engineering Task Force (IETF) for a cool $50 million. The acquisition grants MailChannels exclusive ownersh
Continued thread
System Administration
Week 8, The Simple Mail Transfer Protocol
Shared by a student of mine: Email vs Capitalism, or, Why We Can't Have Nice Things, a talk given by Dylan Beattie at NDC Oslo 2023. Covers a lot of our materials and adds some additional context.
youtu.be- YouTubeEnjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.
Continued thread
System Administration
Week 8, The Simple Mail Transfer Protocol, Part III
In this video, we look at ways to combat Spam. In the process, we learn about email headers, the Sender Policy Framework (#SPF), DomainKeys Identified Mail (#DKIM), and Domain-based Message Authentication, Reporting and Conformance (#DMARC). #SMTP doesn't seem quite so simple any more...
youtu.be- YouTubeEnjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.
Continued thread
System Administration
Week 8, The Simple Mail Transfer Protocol, Part II
In this video, we observe the incoming mail on our MTA, look at how STARTTLS can help protect information in transit, how MTA-STS can help defeat a MitM performing a STARTTLS-stripping attack, and how DANE can be used to verify the authenticity of the mail server's certificate.
youtu.be- YouTubeEnjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.
Didn't one of y'all write an ebook on hosting your own mail server? Or have a blog series about it or something? #hostyourown #smtp
Back in the dim and distant times, when people who attached devices to the internet had some sort of a clue, if you were going to send email by #SMTP, it was vitally important for the sending network interface to have a matching reverse and forward DNS, since that was a very basic spam filter. At least you had some clue whose machines were sending the message, even if the message itself was junk.
Nowadays, it seems that even big 'cloud' systems like #microsoft365 don't have reverse DNS. #email
A #SMTP server that protects you while handling huge amount of messages : Chainmail
My day started with welcoming agmKHzyPT1wK_sLBlBs0KzXZt_18274@skapet.bsdly.net to the imaginary friends population at https://nxdomain.no/~peter/traplist.shtml, this one generated by whatever runs the service check@taknc.com, hosted in AS134963 (Alibaba) address space.
How is your day going?
nxdomain.nobsdly.net - A traplist collected by Peter Hansteen
Hey #Sysadmin|s of the fediverse, I want to ask you for some recommendation, I want to get rid of my old and molden mailsystem.
I just need Mail for a couple accounts and domains for myself and some friends. Would be nice to have a WebGUI, but is not a must.
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System Administration
Week 8, The Simple Mail Transfer Protocol
In this video, we begin our discussion of E-Mail by looking at the components of the larger mail system (the Mail User Agent, Mail Transfer Agent, Mail Delivery Agent, Access Agent); we observe the packets involved in a simple #SMTP exchange and track an email from one system to the other, both through the logs and on the wire, before we then learn to speak SMTP via telnet(1).
youtu.be- YouTubeEnjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.
My self-hosted API #CuckooPost for sending mails without storing SMTP credentials in my projects has got an update.
Thank you @risottobias for your input on the project. I implemented some of your ideas, and now there is a mail log and recipient whitelist in the admin panel.
Find out more about CuckooPost on GitHub, or try it and host it yourself.
Hi there. I'm self hosting my SMTP server for years, and I have 10/10 on https://www.mail-tester.com/
Recently, I've got 2 messages rejected by Apple server (on "@me.com" addresses), and today I've got a SPAM abuse signalement (probably automatic) for those 2 emails! I could send to those same addresses without problem before.
Do other people have had similar problems with Apple SMTP servers recently? What can we do? TIA
www.mail-tester.comNewsletters spam test by mail-tester.commail-tester.com is a free online service that allows you to test your emails for Spam, Malformed Content and Mail Server Configuration problems
heh. my 2011 rantlet "The Problem Isn't Email, It's Microsoft Exchange" https://nxdomain.no/~peter/the_problem_isnt_email_its_microsoft_exchange.html made this week's "Valuable news" by @vermaden https://vermaden.wordpress.com/2025/03/17/valuable-news-2025-03-17/ #smtp #email #exchange #spam #security #timesinks
nxdomain.noThe Problem Isn't Email, It's Microsoft Exchange
I thought I had seen it all when it comes to mail delivery and security issues.
But this morning I was introduced to the fact that there are Exchange admins who will implement a rule that all incoming mail from outside their own organization should be flagged as potentially dangerous and presented to the user with the option to block sender and no option to mark the message or the sender as valid.
Yes, that for every single message.
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@silhouette @lil5 Oh, that shite...
- #Microsoft still refuses to support #IMAP & #SMTP instead?
Cuz I remember their #MAPI bs and #OWA being the only way to use #Thunderbird if the admins didn't allow IMAP & SMTP using a commercial addon...
The Problem Isn't Email, It's Microsoft Exchange -- it turns out my 2011-vintage rant still rings true, now also available trackerless: https://nxdomain.no/~peter/the_problem_isnt_email_its_microsoft_exchange.html #inefficiency #timewasted #email #archiving #microsoft #exchange #compliance #deduplication #unsolvedproblems #smtp #mail #annoyances
nxdomain.noThe Problem Isn't Email, It's Microsoft Exchange
Despite our efforts (such as those described in https://nxdomain.no/~peter/spammers_believe_in_300k_imaginary_friends.html btw that number rolled past 3 million some time back), *some* #spam will occasionally make it all the way through to an inbox and to be read by a person.
Today I offer a prime sample: https://nxdomain.no/~peter/blogpix/20250227_keelygz@vip.126.com_root@skapet.bsdly.net_Conditioner_etc._Inquiry.txt #spamtraps #cybercrime #mail #email #smtp #scams #greytrapping
nxdomain.noThat grumpy BSD guy: The Things Spammers Believe - A Tale of 300,000 Imaginary Friends