Length of supported FTP names

Are there any limits to the number of characters that an FTP id can contain? While creating a new FTP account id, I would always get authentication errors. I finally shortened the name and it works...

Now I have a site that is quite long. I can't shorten the name any further.

Here is the message that occurs (see 331) :

SmartFTP v1.5.990.19
Resolving host name "www.milfordwrestlingassociation.com"
Connecting to 67.15.220.2 Port: 21
Connected to www.milfordwrestlingassociation.com.
220---------- Welcome to Pure-FTPd [TLS] ----------
220-You are user number 1 of 49 allowed.
220-Local time is now 21:35. Server port: 21.
220-IPv6 connections are also welcome on this server.
220 You will be disconnected after 15 minutes of inactivity.
USER ftp1@milfordwrestlingassociation.com
331 User ftp1@milfordwrestlingassociation OK. Password required
PASS (hidden)
530 Authentication failed, sorry
Active Help: https://www.smartftp.com/support/kb/51
QUIT

The limit is very likely with the server. The length of the user name in SmartFTP can be at least 255 chars.

Regards,
-Mat