Added SMTP2Go (with Attachment) Support

[caronc]

Description:

Related issue (if applicable): #379

Added SMTP2Go support supporting bcc, cc, and file attachments. 👍

Account Setup

You can create an account for free on their website.

The next step is to simply generate an API Key associated with your account (on your Dashboard) here/

Syntax

Valid syntax is as follows:

• smtp2go://{user}@{domain}/{apikey}/
• smtp2go://{user}@{domain}/{apikey}/{email}
• smtp2go://{user}@{domain}/{apikey}/{email1}/{email2}/{emailN}

You can adjust what the Name associated with the From email is set to as well:

• smtp2go://{user}@{domain}/{apikey}/?from=Luke%20Skywalker

Parameter Breakdown

Variable	Required	Description
apikey	Yes	The API Key associated with the domain you want to send your email from. You can acquire your API key from your dashboard here.
domain	Yes	The domain associated with the sending email account
user	Yes	The user gets paired with the domain you specify on the URL to make up the From email address your recipients receive their email from.
email	No	You can specify as many email addresses as you wish. Each address you identify here will represent the To.
from	No	This allows you to identify the name associated with the From email address when delivering your email.
to	No	This is an alias to the email variable. You can chain as many (To) emails as you want here separating each with a comma and/or space.
cc	No	Identify users you wish to send as a Carbon Copy
bcc	No	Identify users you wish to send as a Blind Carbon Copy

Example

Send a SMTP2Go notification to the email address bill.gates@microsoft.com

# Assuming the {domain} we set up with our SMTP2Go account is example.com
# Assuming our {apikey} is  api-60F0DD0AB5BA11ABA421F23C91C88EF4
# We already know our To {email} is bill.gates@microsoft.com
# Assuming we want our email to come from noreply@example.com
apprise smtp2go:///noreply@example.com/api-60F0DD0AB5BA11ABA421F23C91C88EF4/bill.gates@microsoft.com

New Service Completion Status

• apprise/plugins/NotifySMTP2Go.py
• setup.py
  • add new service into the keywords section of the setup() declaration
• README.md
  • add entry for new service to table (as a quick reference)
• packaging/redhat/python-apprise.spec
  • add new service into the %global common_description

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

[codecov-commenter]

Codecov Report

Merging #389 (d88b18d) into master (59aa5f5) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            master      #389    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           93        94     +1     
  Lines        11768     11950   +182     
  Branches      1965      2005    +40     
==========================================
+ Hits         11768     11950   +182     

Impacted Files	Coverage Δ
apprise/plugins/NotifySMTP2Go.py	100.00% <100.00%> (ø)

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