Hello James,
Thank you for submitting this bug and reporting a problem with LDAP in 
Thunderbird.  You made this bug report in 2017 and there have been several 
versions of Ubuntu and Thunderbird since then. 

Could you confirm that this is no longer a problem and that we can close the 
ticket? 
If it is still a problem, are you still interested in finding a solution to 
this bug? 
If you are, could you run the following (only once):
apport-collect BUGNUMBER
and upload the updated logs and and any other logs that are relevant for this 
particular issue. 

Thank you again for helping make Ubuntu and Thunderbird better. 
G

** Changed in: thunderbird (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1658348

Title:
  thunderbird's LDAP support requires SHA1

Status in thunderbird package in Ubuntu:
  Incomplete

Bug description:
  We recently tightened up the SSL ciphers offered by our corporate LDAP
  server and it broke Thunderbird's LDAP integration.  Specifically
  Thunderbird couldn't connect unless SHA1 ciphersuites were offered by
  the LDAP server.

  Didn't work:

  prio  ciphersuite    protocols  pfs
  1     AES256-SHA256  TLSv1.2    None  None
  2     AES128-SHA256  TLSv1.2    None  None

  olcTLSCipherSuite: NORMAL:-VERS-SSL3.0:-DHE-DSS:-ARCFOUR-128:-3DES-
  CBC:-CAMELLIA-128-CBC:-CAMELLIA-256-CBC:-SHA1

  Did work:

  prio  ciphersuite    protocols              pubkey_size  signature_algoritm   
    trusted  ticket_hint  ocsp_staple  npn   pfs
  1     AES256-SHA256  TLSv1.2                2048         
sha256WithRSAEncryption  True     None         False        None  None  None
  2     AES256-SHA     TLSv1,TLSv1.1,TLSv1.2  2048         
sha256WithRSAEncryption  True     None         False        None  None  None
  3     AES128-SHA256  TLSv1.2                2048         
sha256WithRSAEncryption  True     None         False        None  None  None
  4     AES128-SHA     TLSv1,TLSv1.1,TLSv1.2  2048         
sha256WithRSAEncryption  True     None         False        None  None  None

  olcTLSCipherSuite: NORMAL:-VERS-SSL3.0:-DHE-DSS:-ARCFOUR-128:-3DES-
  CBC:-CAMELLIA-128-CBC:-CAMELLIA-256-CBC

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