func sensitive(c *imap.Client, action string) imap.LogMask {
mask := c.SetLogMask(imap.LogConn)
hide := imap.LogCmd | imap.LogRaw
if mask&hide != 0 {
c.Logln(imap.LogConn, "Raw logging disabled during", action)
}
c.SetLogMask(mask &^ hide)
return mask
}