When the message reaches the recipient's inbox the server asks for a key that matches the one embedded on the server. If the public key of the recipient's server matches the private key i.e. the entry in the message header which is a padlock the message will be finally accepted. In FreshMail each mailing is protected by a verified SPFbut we also give you more options. Also verify DKIM protection for your sending domain which significantly improves deliverability. How to do it Check here.
There are “dangerous” addresses on your lists In email marketing activities the basic activity that affects deliverability is the systematic maintenance of address base hygiene. Be sure to collect sign ups using the double opt in model . This has a significant impact on protecting the recipient list from addresses that are unsafe for message deliverability. Also don't forget about addresses called Spamtraps . They are used by e mail providers to detect the so called spammers. After Taiwan WhatsApp Number List about months of no inbox activity it becomes a spamtrap. So if you continue to send to such an address for spam filters you become a sender sending unwanted content and as a result your domain reputation and deliverability are lowered. Spamtraps i.e. unused addresses are also often included in public address databases available on the Internet.
That's why it's so important to ship to addresses that aren't publicly available.
Conducting such a mailing from the point of view of the GDPR is in short illegal. More about it here . How not to get into SPAM Analyze After each sending analyze the statistics available under the Reports tab from the FreshMail account. First of all pay attention to the addresses that have received the hard bounce status this means that the receiving server rejected the message.