Issue with sending email "Interrupted system call" about mutt-wizard HOT 4 CLOSED

Is your computer able to reach the SMTP server that you're trying to send to? Try installing telnet and nmap to test it out. Then:

telnet mailserverdomain.tld 587
nmap -p 587 mailserverdomain.tld

To be sure you should double check what the mailserver domain is by checking the smtp_url of the following config:
.config/mutt/accounts/accountname.muttrc

from mutt-wizard.

Honestly, your issue doesn't seem related to the mutt-wizard at all, but it would be interesting to see what is happening.

from mutt-wizard.

I used nmap and the smtp_url provided by the accounts muttrc file:

Starting Nmap 7.70 ( https://nmap.org ) at 2018-07-31 19:32 CEST
Nmap scan report for mail.cock.li (185.100.85.212)
Host is up (0.055s latency).
Other addresses for mail.cock.li (not scanned): 2a06:1700:0:b::c0cc
rDNS record for 185.100.85.212: cock.li

PORT    STATE    SERVICE
587/tcp filtered submission

Nmap done: 1 IP address (1 host up) scanned in 0.98 seconds

so nmap seems to do fine not fine since it is litterly saying "filtered" (good that I can read), however, telnet is stuck connecting (to what looks like is a IPv6 domain).

So looks like it's got an issue with IPv6, and I'm honestly not sure if my current connection even supports it, so I guess I'll have to look into that.

from mutt-wizard.

Filtered is not good. That means that your connection is being blocked by a firewall.
https://nmap.org/book/man-port-scanning-basics.html

The cock.li server has blocked your connections via firewall.
Here is what it looks like when I try from my computer. This is what it should look like by the way:

host:~ user$ dig +short mail.cock.li
185.100.85.212
host:~ user$ telnet 185.100.85.212 587
Trying 185.100.85.212...
Connected to cock.li.
Escape character is '^]'.
220 cock.li ESMTP Postfix (Debian/GNU)
}^]
telnet> quit
Connection closed.
host:~ user$ nmap -p 587 mail.cock.li

Starting Nmap 7.60 ( https://nmap.org ) at 2018-07-31 14:44 CDT
Nmap scan report for mail.cock.li (185.100.85.212)
Host is up (0.16s latency).
Other addresses for mail.cock.li (not scanned): 2a06:1700:0:b::c0cc
rDNS record for 185.100.85.212: cock.li

PORT    STATE SERVICE
587/tcp open  submission

Nmap done: 1 IP address (1 host up) scanned in 0.89 seconds

from mutt-wizard.