8fd14bfca7
RFC 2822 states that line lengths in emails must be less than 998. Some MTA's add newlines to messages if any line exceeds a certain limit (the exact limit varies). Sendmail goes so far as to add '!\n' after the 990th character in a line. To ensure that bulk mail messages look consistent long lines are wrapped to a conservative length. LMS-1466
23 lines
781 B
Python
23 lines
781 B
Python
"""
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Utilities related to mailing.
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"""
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import textwrap
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MAX_LINE_LENGTH = 900
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def wrap_message(message, width=MAX_LINE_LENGTH):
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"""
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RFC 2822 states that line lengths in emails must be less than 998. Some MTA's add newlines to messages if any line
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exceeds a certain limit (the exact limit varies). Sendmail goes so far as to add '!\n' after the 990th character in
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a line. To ensure that messages look consistent this helper function wraps long lines to a conservative length.
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"""
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lines = message.split('\n')
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wrapped_lines = [textwrap.fill(
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line, width, expand_tabs=False, replace_whitespace=False, drop_whitespace=False, break_on_hyphens=False
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) for line in lines]
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wrapped_message = '\n'.join(wrapped_lines)
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return wrapped_message
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