The Federal Labour Court (BAG) has clarified the following in a decision
(14.09.2020, 6 AZB 23/20) A written pleading transmitted via BEA has the effect
of meeting the deadline if it is signed or if it originates from the lawyer's
own subject. If, for example, a partner of a law firm sends an unsigned written
statement from his own account which is signed by another lawyer in the firm,
the deadline is not met.