To prevent firewall issues and ensure that your emails reach their intended recipients, consider the following:
Authenticate Your Emails: Use authentication methods such as SPF, DKIM, and DMARC to verify the legitimacy of your emails. Monitor Your Sender Reputation: Regularly check your sender reputation to ensure that your IP address is not blacklisted. Clean Your Email List: Remove inactive or invalid email addresses from your list to improve deliverability rates and reduce the risk of getting flagged by firewalls. Optimize Email Content: Ensure that your email content is clean, relevant, and free from suspicious links or attachments.