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SMTP debugging for Humans

January 30, 2020 by Igor Drobot Leave a Comment

A lot of different tools are around the internet which can be useful to determine different SMTP troubles.

The most of them are very useful but they are all reachable over the internet and don’t provide any kind of API for integration of monitoring or complex integration in (pre)deployment pipelines.
This is a short overview of some command line tools for developers and administrators, to check the e-mail flow during developing, emulate and intercept outgoing emails and afterwards for maintaining the setups.

[Read more…]

Filed Under: Linux, Programming, Python Tagged With: Debug, Python, SMTP

Debug on a Juniper firewall

April 9, 2011 by Igor Drobot Leave a Comment

Example, you want to debug a connection from a client(192.168.110.20) to the internet (google – 8.8.8.8).

From your client you start a continuous ping to 8.8.8.8, now you are able to debug the traffic on your juniper device.
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Filed Under: Linux Tagged With: Debug, ffilter, flow control, Juniper

Debug squid ACL matches

January 24, 2011 by Igor Drobot Leave a Comment


Bad situation if you have too much ACLs in your squid config and important site gets a DENIE cause one or more of this all ACL’s matches.

Debugging helps you to find the right ACL.

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vim /etc/squid3/squid.conf
# Debugging for your ACLs
debug_options 28,9

vim /etc/squid3/squid.conf # Debugging for your ACLs debug_options 28,9

Your debugged results will appear in your cache.log

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less /var/log/squid3/cache.log

less /var/log/squid3/cache.log

Filed Under: Linux, Networking Tagged With: ACL, Debug, Proxy, Squid3