For your creations to be read, you will need to get past the anti-spam filter. With the ever-present threat of unwanted mail, filtering is increasingly strict, and ISPs make a point of filtering very precisely. Filtering can be done in several ways, but they all share the same goal: identifying advertising messages that do not respect the user. The analysis may focus on the email subject, the sender name or the domain. Bayesian filtering remains the most widely used and the most reliable: it is based on a mathematical formula that calculates the probability that an email is spam. The anti-spam filter can therefore be an obstacle in getting your message delivered.

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Still on the subject of the sender address, you must make sure you are recognisable. Avoid pseudonyms and be as transparent as possible: this will increase the user's trust. Don't hesitate to use several addresses, one for customer service, another for after-sales service, and so on.
As for the subject line, as explained above, it must meet certain criteria to get past the anti-spam filter. That's not all: it must also be optimised so that the recipient wants to open the email:

• Mention your brand/company name
• subject line length
• the name of what you are offering, honesty
• the duration of the offer
• Personalisation