What are the best practices for email subject lines?

[ferriesthai]

What are the best practices for email subject lines?

[sulbha]

Hi Friend,
best practices for effective email subject lines

Get personal.
Segment your audience for a highly relevant message.
Be concise and clear about what your email delivers.
Don't over-promise or mislead.
A/B test different email subject lines.
Avoid spam trigger words.
Use numbers.
Avoid emojis.