Welcome to Idiom's interface for reading and composing email on the Web!
Warning: if you have an 'mbox' file in your home directory this web mail client will move your email there. You will generally only have an mbox file if you also read email in the unix shell. The only downside to having your email moved to the 'mbox' file is that you will no longer be able to retreive that email via POP3 or IMAP.
Note: using both webmail and another mail client to read your mail will likely result in seeing placeholder emails in your mailbox. These have a subject that reads 'DON'T DELETE THIS MESSAGE -- FOLDER INTERNAL DATA'. They can be safely deleted.
Note: by default sent mail is not saved in the 'Sent Mail' folder, you can enable this via 'Settings' on the side menu bar.