Anything that may trigger an additional spam filter
or that your prospects may read as spam should be avoided.
No spam words such as a free trial, special characters, or text formatting. For spam filters and people, these are indicators of spam or malware.
Additionally, avoid using images, attachments, or hyperlinks anywhere in the text.
It may be tempting to send out white papers or sign-up links. Still, when you’re running numerous campaigns, it ends up being more detrimental to your deliverability than anything else. Only start sending additional content once you’ve ensured their responsiveness and interest. Anything before that will be seen negatively.
Signatures should also be as clean as possible so your prospects are more likely to receive the email in their inbox.
An excellent way to do this is to create a separate address to send out emails. Keep your official signature and email for internal issues or existing clients separate from the email you use to send out campaigns.