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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for March 26th, 2020

MacOS: starting Visual Studio Code from the finder

Posted by jpluimers on 2020/03/26

On MacOS, a long standing wish from many developers has been to open a folder with Visual Studio Code: [WayBack] Mac OS X :: “Open Folder With” VS Code · Issue #1223 · Microsoft/vscode · GitHub.

There are many reasons for wanting this, and other tools can do this too (like Terminal, TextWrangler, Source Tree, Beyond Compare), so I was a bit surprised Visual Studio Code does not have it by default.

After initially being closed, the issue has been open for a while, so I started digging a bit for solutions that are easy to configure or install.

The last one is currently on the top of my list, so I copied and installation instructions, and added a few screenshots to explain the already included video below.

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Posted in .NET, Development, Software Development, Visual Studio and tools, vscode Visual Studio Code | Leave a Comment »

Determine actual message size limit when you only get “552 5.3.4 Message size exceeds fixed limit”

Posted by jpluimers on 2020/03/26

Often when you send large emails the only  reply you get is a non-descriptive message like 552 5.3.4 Message size exceeds fixed limit from the SMTP server without an indication what the limit actually is.

Most SMTP servers however implement extensions in the EHLO greeting that returns a SIZE mail parameter. You can query it by hand using this:

telnet smtp
Connected to
Escape character is '^]'.
220 ESMTP 32si3005669edb.510 - gsmtp
EHLO at your service, []
250-SIZE 157286400
221 2.0.0 closing connection 32si3005669edb.510 - gsmtp
Connection closed by foreign host.

There you can see the maximum message size at the time of writing is 157286400 bytes which is about 150 megabytes.

There is a nice Python script showing how to obtain it at [WayBack] Getting Information from EHLO | Erle Robotics Python Networking Gitbook Free (note this one does send an email, so you might want to trim the example if you just want to see the size).

More background reading:

Trimming down the Python script so it queries message size for each mail server of a domain

This turns out to be a tad more complex, because DNS functionality isn’t part of core Python, and the rdata part of DNS records ends with a dot, which might not be usable with the SMTP library.

References for me when trimming down:


Posted in Communications Development, Conference Topics, Conferences, Development, Event, Internet protocol suite, Power User, SMTP | Leave a Comment »

GitHub – alexmojaki/birdseye: Quick, convenient, expression-centric, graphical Python debugger using the AST

Posted by jpluimers on 2020/03/26

This is soooo nice! [WayBackGitHub – alexmojaki/birdseye: Quick, convenient, expression-centric, graphical Python debugger using the AST

It runs on localhost:7777

Via: [WayBack] Birdseye ist eine interessante Lösung, um detailliert nachzuvollziehen, was beim Aufruf von Python-Funktionen und der Abarbeitung von Schleifen geschieh… – Martin Vogel – Google+


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Posted in Development, Python, Scripting, Software Development | Leave a Comment »

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