Collaborate Disseminate
I read this https://wjianz.wordpress.com/2014/09/03/howto-installconfigure-msmtp-and-mutt-on-ubuntu/
It says
The issuer name is Google Internet Authority G2, we got the CA
certificate here.
But it is not clear how t… Continue reading How figure out the google certificate url? [on hold]
I am studying the SMTP protocol and follow a course materials to setup a PoC spoofed email by talking with a SMTP server of our department.
This is what I have right now:
shuaiw@shuaicpu1:~$ telnet mail.XXXXXX 25
Trying XX… Continue reading Spoofed email: can’t determine Purported Responsible Address
I wanted to know if there is a way of searching a string trough the responses given by standard commands of standard services like telnet, smtp, etc using nmap.
For example, given a smtp server that answers “This is the sear… Continue reading nmap – Searching a string from some standard services using nmap
Email clients like Spark for macOS have a feature where a user can send an email later, at any given time, even when the computer is turned off. An SMTP server needs a password based authentication, though.
Does that mean th… Continue reading How do email clients "send later" without storing a password?
I am a bit confused when it comes to spammers sending spam from botnets. I know that protection mechanisms like SPF and DKIM are there to validate the mail through ip whitelisting and cryptographic signing. But how would a sp… Continue reading How does a spammer typically setup smtp infrastructure? [on hold]
With the deprecation of TLS 1.0 on the horizon, I’m curious how others are handling connectivity and mail delivery issues for dated client environments.
Lets face it, there are more environments live on the internet running deprecated pro… Continue reading TLS 1.0 Deprecation and Mitigation Tactics
I’ve noticed that the subject in one of the spam emails looks like this in source:
Subject: Offe=?UTF-8?Q?=EF=BB=BF?=r fr=?UTF-8?Q?=EF=BB=BF?=om C=?UTF-8?Q?=EF=BB=BF?=redi=?UTF-8?Q?=EF=BB=BF?=t On=?UTF-8?Q?=EF=BB=BF?=e Ba=?UTF-8?Q?=EF=BB=… Continue reading Weird character sequence in email subject
I’ve noticed some strange activities from some remote host connected to our SMTP mail server. Queries contains non-ASCII characters, below is the copy of one of them (to each query our server responded with “command not imple… Continue reading Suspicious SMTP server client activity – non-ASCII queries
I am relatively new to managing mail server, although i am familiar with webhosting servers not running dedicated email services.
Postfix is configured to use sasl-password authentication
I have setup a mail server and am n… Continue reading Postfix SMTP – Can I use SSH public keys instead of sasl password
Is it possible when doing Client/Server socket programming to use SMTP as a way for the C2 sever to broadcast commands to the client? Ive seen it done in Python, is it possible to do it in C ?
To get an idea of what I’m loo… Continue reading Client/Server Socket programing with SMTP [on hold]