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pf and Microsoft Exchange IMAPS

I'm trying to redirected outside traffic to internal Exchange Server using IMAPS protocol :
 rdr on $ext_if proto tcp from any to any port 993 ->
 pass in quick on $ext_if \
        proto tcp \
        from any to port imaps flags S/SA synproxy state
Outlook client seem to pass the firewall but after that it hung on "Protection ..". Does anyone here have manage to get PF and IMAPS Protocol from Exchange to work  ?