host parsed from user login (if present) for Emails

[caronc]

Description:

Related issue (if applicable): n/a

This was a report made on Discord where the URL should have worked (imo):

• mailtos://?smtp=mobile.charter.net&pass=password&user=name@spectrum.net

Apprise wasn't smart enough to pull the spectrum.net hostname from the user login for the host until this PR. The user above can still use the URL:

• mailtos://spectrum.net?smtp=mobile.charter.net&pass=password&user=name@spectrum.net

After this PR, the first URL will work. To avoid ambiguity, emails can now also be specified in the hostname if content was parsed elsewhere; hence the following URL is also valid now:

• mailtos://Jason Smith<jsmith%40yahoo.ca>?smtp=mobile.charter.net&pass=password&user=name@spectrum.net
  • Note: %40 == @. The idea is if you don't specify a hostname, you're not restricted from putting in your emails you want to transmit to. This becomes the to and flows with current design.

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• No lint errors (use flake8)
• 100% test coverage

Testing

Anyone can help test this source code as follows:

# Create a virtual environment to work in as follows:
python3 -m venv apprise

# Change into our new directory
cd apprise

# Activate our virtual environment
source bin/activate

# Install the branch
pip install git+https://github.com/caronc/apprise.git@email-host-detection-from-source

# Test out the changes with the following command:
apprise -t "Test Title" -b "Test Message" \
  "mailtos://?smtp=mobile.charter.net&pass=password&user=name@spectrum.net"

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.27%. Comparing base (6cd528c) to head (ffb2dfd).

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1095   +/-   ##
=======================================
  Coverage   99.27%   99.27%           
=======================================
  Files         138      138           
  Lines       17954    17964   +10     
  Branches     3663     3667    +4     
=======================================
+ Hits        17824    17834   +10     
  Misses        121      121           
  Partials        9        9           

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