spam
Anti-spam filters measure different aspects of the email sent to allow or not its entry into the inbox. Some factors that determine the deliverability of our messages are:
– HTML . The HTML must be valid, without syntax errors and well structured. Avoid blank lines in the code.
– HTML/TEXT . If our email has an HTML layout, we must attach the text version to the message.
– Blacklist/Whitelist: If our address is admitted in the user’s contacts, it will positively affect the reputation, while if we are marked as SPAM, we will be penalized.
– Sending history. Filters have memory and know the behavior of a telecommunications email list sender (sending frequency, openings, penalties…). Therefore, reputation does not depend on a single sending but on the usual behavior of the sender.
– Text-image ratio . An email with a lot of image weight and little text is more likely to be classified as SPAM.
– Subject : You should avoid words like “Discount”, “Promotion”, “Offer”, “Free” as well as capital letters and special symbols (e.g. exclamation points) in the subject line. There are topics and phrases related to SPAM that are usually penalized, such as talking about large amounts of money, weight loss, etc.
– Volume and speed . Mass mailings with a ratio of too many mailings per minute can be considered SPAM. As far as possible, we should space out mailings to very large mailing lists over time.
– From : We should indicate the sender and the reply address.
– IP reputation . The reputation of the IP or subdomain from which the mailing is made is one of the key factors in deliverability. Various factors influence the improvement or penalization of this reputation. We will talk about these specific factors in the next article.
Remember to always offer the user the possibility of adding your address to their contact list and thus ensure the delivery of future emails.
