Yahoo Mail @ymail.com also has the stationery feature.

A few weeks ago, Yahoo! Infinite Mail launched the stationery feature. However, other Yahoo! Mail services, such as Yahoo! Classic Mail, ymail.com, and rocketmail.com with new domain email addresses did not introduce this feature at the same time. Moreover, the stationery feature in the English version of Yahoo! Mail is a paid service, falling under the content of Mail Plus.