Which character encoding is preferred for Mailjet? N.Makarov June 08, 2020 08:05 Updated Follow We support most charset encodings. However, using UTF-8 in your emails is recommended for better compatibility. Related articles How can I configure my SMTP parameters? How do I change my SMTP settings in Outlook? Can I send to my Mailjet contact lists via SMTP/API? How can I use Mailjet with Thunderbird? Why am I getting a ‘Relay Access Denied’ error when using SMTP relay?