OTRS: using SHA-256 algorithm for IMAPS sessions

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Hi.

We are using OTRS, which receive mail through external mail provider via
IMAPS.

Mail provider is going to stop supporting mail clients which use unsafe
SHA-1 signing algorithm. To continue using this mail provider we must be
sure that our OTRS uses exactly SHA-256 algorithm to sign certificates
during IMAPS session.

How could I check, what signing algorithm is used for IMAPS? Where can i
find configs for this?

OTRS: 4.0.13 OS: CentOS 7.1

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<div dir=3D"ltr"><p style=3D"margin:0px 0px 1em;padding:0px;border:0px;font=
-size:15px;clear:both;color:rgb(34,36,38);font-family:Arial,&#39;Helvetica =
Neue&#39;,Helvetica,sans-serif;line-height:19px">Hi.</p><p style=3D"margin:=
0px 0px 1em;padding:0px;border:0px;font-size:15px;clear:both;color:rgb(34,3=
6,38);font-family:Arial,&#39;Helvetica Neue&#39;,Helvetica,sans-serif;line-=
height:19px">We are using OTRS, which receive mail through external mail pr=
ovider via IMAPS.</p><p style=3D"margin:0px 0px 1em;padding:0px;border:0px;=
font-size:15px;clear:both;color:rgb(34,36,38);font-family:Arial,&#39;Helvet=
ica Neue&#39;,Helvetica,sans-serif;line-height:19px">Mail provider is going=
 to stop supporting mail clients which use unsafe SHA-1 signing algorithm. =
To continue using this mail provider we must be sure that our OTRS uses exa=
ctly SHA-256 algorithm to sign certificates during IMAPS session.</p><p sty=
le=3D"margin:0px 0px 1em;padding:0px;border:0px;font-size:15px;clear:both;c=
olor:rgb(34,36,38);font-family:Arial,&#39;Helvetica Neue&#39;,Helvetica,san=
s-serif;line-height:19px">How could I check, what signing algorithm is used=
 for IMAPS? Where can i find configs for this?</p><p style=3D"margin:0px 0p=
x 1em;padding:0px;border:0px;font-size:15px;clear:both;color:rgb(34,36,38);=
font-family:Arial,&#39;Helvetica Neue&#39;,Helvetica,sans-serif;line-height=
:19px">OTRS: 4.0.13 OS: CentOS 7.1</p><p style=3D"margin:0px 0px 1em;paddin=
g:0px;border:0px;font-size:15px;clear:both;color:rgb(34,36,38);font-family:=
Arial,&#39;Helvetica Neue&#39;,Helvetica,sans-serif;line-height:19px"><br><=
/p></div>

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