We have a zero-tolerance policy for spam. Learn more about our strict anti-spam rules.
Last updated on August 31, 2026
By creating an account and agreeing to our Terms of Use, you are also agreeing to this Anti-Spam Policy.
Using MailerSend you can send transactional and marketing emails, SMS, and WhatsApp messages. Transactional communications are automated messages that you send to facilitate transactions or provide a product or a service. Marketing communications are newsletters you send with the sole purpose of marketing your product or service.
Spam is any email or message you send to someone who has not given you their direct permission or when you do not have other legal grounds to contact them on the topic of the email or message.
You need to have a valid lawful basis to send transactional emails and messages that are necessary for using your application or service (like password reminders, invoices, receipts, etc.). And if you send a newsletter, you must have valid consent from the person receiving your email or message.
When you send an email or message to someone you do not know, that is an "unsolicited" email or message. Sending one unsolicited email or message to someone is obviously not spam. But when you send an unsolicited email or message to an entire list of people you do not know, that is spam.
You cannot send to any email address or phone number which:
You do not have a valid lawful basis to contact in relation to the topic of the email or message you are sending or, in the case of marketing communications, you do not have a valid consent to send newsletters;
You bought, loaned, rented or in any way acquired from a third party, no matter what they claim about the quality or permission;
You have not contacted them via email or message in the last 2 years. Permission does not age well and these people have either changed their email address and/or phone number or will not remember giving their permission in the first place; or
You scraped or copy and pasted from the web. Just because people publish their email address or phone number does not mean they want to hear from you.
Every marketing email you send using MailerSend must include a single-click, clear and visible unsubscribe link added using MailerSend's "track unsubscribes" feature that instantly adds the recipient to your MailerSend suppression list. Once they unsubscribe, you must stop sending them marketing emails.
Every marketing SMS and WhatsApp message you send using MailerSend must include clear instructions on how to opt out. For example, you can include the sentence: “Reply STOP to unsubscribe” at the end of the initial message sent to the consumer, or “reply STOP to cancel”. Once they opt out, you must stop sending them SMS and WhatsApp messages.
We reserve the right to suspend your account immediately and start investigating your activity if:
You have a high bounce rate;
Your emails, SMS and/or WhatsApp messages have a high percentage of spam complaints;
Your marketing emails have a high percentage of unsubscribes.
MailerSend reserves the right, at its sole discretion, to decide whether the above mentioned bounce rate, spam complaints or unsubscribes are considered high or not.
If it turns out that you were sending emails, SMS and/or WhatsApp messages without having a valid legal ground, we will terminate your account. We can ask you to prove that you have a legal ground and we can close your account if you do not have such proof. Otherwise, we will re-activate your account and you will be able to use the service again.
If you spam using your MailerSend account, you can be sure to expect the following:
Your account will be terminated immediately;
No refund will be made.
