Credit card statements taking up 1.5 MB email hosting

Email is not free, and storing emails takes up space on the email hosting server. However indian companies keeping sending card statements of 1.5 Mb, and expect their customer to store these records indefinitely
Storing offline is very risky, because these records are easily erased.

PDF files can take 100 kb, however the credit card companies do not reduce the file size, insist on sending huge files to their customer, whose mailbox becomes full.