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4ecc5461d3
This patch adds DKIM signing using https://github.com/driusan/dkim tools to the example hook. It also adds an optional integration test to exercise signing and verification, and corresponding documentation.
44 lines
1.3 KiB
Python
Executable File
44 lines
1.3 KiB
Python
Executable File
#!/usr/bin/env python3
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#
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# Simple SMTP client for testing purposes.
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import argparse
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import email.parser
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import email.policy
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import re
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import smtplib
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import sys
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ap = argparse.ArgumentParser()
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ap.add_argument("--server", help="SMTP server to connect to")
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ap.add_argument("--user", help="Username to use in SMTP AUTH")
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ap.add_argument("--password", help="Password to use in SMTP AUTH")
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args = ap.parse_args()
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# Parse the email using the "default" policy, which is not really the default.
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# If unspecified, compat32 is used, which does not support UTF8.
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rawmsg = sys.stdin.buffer.read()
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msg = email.parser.Parser(policy=email.policy.default).parsestr(
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rawmsg.decode('utf8'))
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s = smtplib.SMTP(args.server)
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s.starttls()
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if args.user:
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s.login(args.user, args.password)
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# Send the raw message, not parsed, because the parser does not handle some
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# corner cases that well (for example, DKIM-Signature headers get mime-encoded
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# incorrectly).
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# Replace \n with \r\n, which is normally done by the library, but will not do
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# it in this case because we are giving it bytes and not a string (which we
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# cannot do because it tries to incorrectly escape the headers).
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crlfmsg = re.sub(br'(?:\r\n|\n|\r(?!\n))', b"\r\n", rawmsg)
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s.sendmail(
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from_addr=msg['from'], to_addrs=msg.get_all('to'),
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msg=crlfmsg,
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mail_options=['SMTPUTF8'])
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s.quit()
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