Due to space limitations, I have included YAM in its archived format.

Use lha to extract it.

I've included only the main YAM21.lha archive.

Thanks

=============================================================================
---------------------------------------------------------------------------
                     YAM 2.1 - Installation notes
---------------------------------------------------------------------------

To minimize download time, YAM 2.1 is distributed in four different LhA
archives which must be unpacked into the same directory before installation.

YAM21.lha        YAM 2.1 basic installation for 68020 processors or better,
                 includes English manual
YAM21cpu.lha     Executables optimized for 68040 and 68060 processors
YAM21loc.lha     Foreign language support (catalogs and manuals)
YAM21con.lha     Additional graphics, ARexx scripts, etc.

YAM 1.3.x users
---------------
Before you start the installation script, it's strongly recommended that
you create a backup of the old YAM directory including all folders and
configuration files. Now you should install YAM 2.1 into your old YAM
directory. YAM 2.1 will automatically convert configuration files from
YAM 1.3.x into the new format.


What's new since YAM 2.0?
-------------------------

- Fixed: Checkmarks in textstyle menu in write window were not
  updated correctly
- Fixed: When selecting a mail for reading which was already opened,
  the read window was put to the front but was not activated
- Fixed: <SMTP server>:<port number> didn't work and the port number
  was removed after sending mail
- Fixed: (Re)Loading a .config file didn't update the POP3 account
  names in the 'config / TCP/IP' section (Bug #266)
- Fixed: Alias/name completion: expansion to realname now only
  happens if there's no matching alias (Bug #275)
- Fixed: If a folder and a separator had the same name, moving
  messages to the folder using filters didn't work (Bug #281)
- Fixed: When using RTPatch or MFR, the attachment file requester
  didn't work for single files
- Fixed: Incorrect export files were generated if exported messages
  didn't end with a line break (Bug #243)
- Fixed: Recipient name-completion changed case of the entered
  address according to the recognized name to complete (Bug #274)
- Fixed: Adding multiple attachments using drag&drop didn't work
- Fixed: Drag&drop sorting of the folder list didn't allow to move
  an folder to the end of the list
- Fixed: When selecting a file starting with a dot for pack'n'add,
  then the suggested name of the archive was blank
- Fixed: The mailbox status appicon didn't appear on startup when the
  incoming folder was empty
- Fixed: Some binary attachments that contains only characters < 20h
  weren't encoded at all
- Fixed: YAM didn't read CustomField2 (filter settings) from the
  .config file
- Fixed: New temporary files couldn't be created after displaying a
  corrupted MIME message
- Fixed: When reading a message, YAM always asked for a password if
  the last folder in the list was protected
- Fixed: Message list now gets keyboard input if no other object is
  activated
- Fixed: LocalCharset option was only used for headers, but not for
  the message body
- Fixed: %t placeholder (for taglines) inserted an extra linefeed
  in the signature (Bug #251)
- Fixed: When renaming a folder directory, YAM moved its contents
  instead of renaming it (Bug #256)
- Fixed: Enforcer hit when clicking support@yam.ch before main
  window has been loaded (Bug #269)
- Fixed: Enforcer hit when cancelling address selection after
  clicking GetAddress (Bug #276)
- Fixed: Enforcer hit after entering an invalid address/alias in
  the write window (Bug #233)
- Fixed: Enforcer hits after editing a message which is not in the
  outgoing folder
- Fixed: Enforcer hits when importing MIME.prefs (Bug #270)
- Fixed: When using openurl.library, YAM always opened a new
  browser window, ignoring OpenURL prefs
- Fixed: When opening the glossary window, the abbreviation list
  didn't receive keyboard input
- Fixed: When adding a new filter, some fields were copied from the
  previous one
- Fixed: Undo gadget wasn't ghosted when undo buffer was empty
- Fixed: Memory leaks: some temporary buffers were not freed until
  YAM terminates (Bug #253)
- Multi-user preferences: it's no longer possible to remove manager
  priviledges for all users
- Multi-user preferences: the mail directory path of the default
  user is automatically adjusted if it's left empty
- Improved multitasking: windows can be closed during mail
  transfers (Wish #252)
- Smarter generation of subjects in replies (Bugs #269,#273)
- When you choose to send e-mail anonymously, YAM now automatically
  removes signature and personal information
- HandleLHA.yam script now opens console on YAM screen and uses
  real file requester
- YAM now also recognizes URL starting with news:, telnet: and
  gopher: (Wish #299)
- Address book list is now accepting keystrokes even when it's not
  the active object
- Added default pattern strings in filename requesters (Wish #092)
- ARexx hooks being used are now highlighted in the list (Wish #216)
- Pack'n'add no longer stores the entire file path in the created
  archive
- Updated English and German AmigaGuide manuals
- When printing an address book group entry, all entries belonging
  to that group will be printed too (Wish #113)
- Automatic form decoder now recognizes 'application/x-url-encoded'
- URL-encoded message parts are now processed like texts and included
  in replies etc. (Wish #315)
- New feature: Pressing Shift while clicking on the Reply button
  forces a private reply (address in From field is used) (Wish #014)
- New feature: Pressing Alt while clicking on the Reply button forces
  a mailing list reply (address in ReplyTo field is used) (Wish #014)
- New feature: Pressing Ctrl while clicking on the Reply button
  omits quoting of the original message (Wish #100)
- New feature: Pressing Shift while clicking on the Forward button
  bounces the message
- New feature: Pressing Ctrl while clicking on the Forward button
  omits forwarding of the attachments
- New feature: Pressing Shift while clicking on the Delete button
  immediately deletes the messages
- New feature: Pressing Shift while clicking on the Prev/Next
  buttons displays the previous/next unread message
- New feature: Pressing Shift while clicking on the Filter button
  filters the active message only (Wish #308)
- New feature: Pressing Shift while clicking on the GetMail button
  starts a mail exchange (Wish #106)
- New feature: ARexx command MAILINFO now returns compressed
  message-id in stem component MSGID (Wish #292)
- New feature: ARexx command USERINFO returns number of folders in
  stem component FOLDERS (Wish #311)
- New feature: New ARexx command MAILCHANGESUBJECT subject/A changes
  the subject of the selected message(s) (Wish #309)
- New feature: New ARexx command GETURL url/A filename/A downloads
  a file from the WWW (used by LocateUser.yam script)
- New feature: Added QUIET/S to ARexx commands MAILWRITE, MAILREPLY,
  MAILFORWARD, MAILBOUNCE and MAILEDIT to keep the write window closed
  (Wish #263)
- New feature: Hidden option 'IOCInterface' specifies MiamiDx/Genesis
  interface that should be used for the  online check
- New feature: Hidden option 'StackSize' allows to set the stack size
  of launched programs, e.g. PGP (defaults to 40000 bytes)
- New script: DeleteUnread.yam removes all unread messages in the
  current folder (Wish #306)
- New script: UpdateAddresses.yam updates new addresses for existing
  people in the address book (Wish #296)
- New script: KillDuplicates.yam removes duplicate messages in
  current folder
- New script: LocateUser.yam connects to the NetGeo server to get
  city, state and country of the sender and optionally shows it on
  a worldmap