BlueMail adds no attachment limit of its own, so you can send as much as your provider allows. However, most email providers do set a limit on the overall size of a single email that can be sent to their servers. This limit is typically in the 10-25MB range. Please consult your specific provider for more detailed information.
An email that exceeds the provider's limit is rejected by the server and stays in the Outbox. See Why Is My Email Stuck in the Outbox? for how to spot the error and what to do.
Working with attachments generally is covered in How do I Manage my Attachments?, including which file types you can attach, viewing what you have received, saving one to a folder of your choice, and whether they download automatically. If an attachment arrives as a winmail.dat file, BlueMail opens what is inside it — see what winmail.dat is and how to open it.
