mail_fingerprints

#!/bin/sh

POP_FILE="$(mktemp)"
IMAP1_FILE="$(mktemp)"
IMAP2_FILE="$(mktemp)"
SMTP1_FILE="$(mktemp)"
SMTP2_FILE="$(mktemp)"
SMTP3_FILE="$(mktemp)"

echo "" | openssl s_client -connect pop.gmail.com:995 -showcerts > "$POP_FILE" 2> /dev/null
echo "" | openssl s_client -connect imap.gmail.com:993 -showcerts > "$IMAP1_FILE" 2> /dev/null
echo "" | openssl s_client -connect imap.kolabnow.com:993 -showcerts > "$IMAP2_FILE" 2> /dev/null
echo "" | openssl s_client -connect smtp.gmail.com:587 -starttls smtp -showcerts > "$SMTP1_FILE" 2> /dev/null
echo "" | openssl s_client -connect smtp.kolabnow.com:587 -starttls smtp -showcerts > "$SMTP2_FILE" 2> /dev/null
echo "" | openssl s_client -connect smtp.novuscom.net:587 -starttls smtp -showcerts > "$SMTP3_FILE" 2> /dev/null

echo "pop.gmail.com:"
openssl x509 -fingerprint -md5 -noout -in "$POP_FILE" && rm "$POP_FILE"

echo
echo "imap.gmail.com:"
openssl x509 -fingerprint -md5 -noout -in "$IMAP1_FILE" && rm "$IMAP1_FILE"

echo
echo "imap.kolabnow.com:"
openssl x509 -fingerprint -md5 -noout -in "$IMAP2_FILE" && rm "$IMAP2_FILE"

echo
echo "smtp.gmail.com:"
openssl x509 -fingerprint -sha256 -noout -in "$SMTP1_FILE" && rm "$SMTP1_FILE"

echo
echo "smtp.kolabnow.com:"
openssl x509 -fingerprint -sha256 -noout -in "$SMTP2_FILE" && rm "$SMTP2_FILE"

echo
echo "smtp.novuscom.net:"
openssl x509 -fingerprint -sha256 -noout -in "$SMTP3_FILE" && rm "$SMTP3_FILE"