diff --git a/s3-sync-backup.sh b/s3-sync-backup.sh
index 98d1476..3ab05ea 100755
--- a/s3-sync-backup.sh
+++ b/s3-sync-backup.sh
@@ -7,59 +7,84 @@ remote_path=""
 email_from=""
 email_name=""
 email_to=""
-send_email_script_path="/etc/sg-send-email.sh"
+send_email_script_path="/etc/send-email.sh"
+email_provider=""
 
 print_usage () {
-   echo "Usage: "$0" -l LOCAL_PATH -r REMOTE_PATH -f EMAIL_FROM -n EMAIL_NAME -t EMAIL_TO -s SEND_EMAIL_SCRIPT_PATH"
-   echo "LOCAL_PATH - local path to sync"
-   echo "REMOTE_PATH - remote path in format remote:bucket/path"
-   echo "EMAIL_FROM - sender's email address"
-   echo "EMAIL_NAME - sender's name"
-   echo "EMAIL_TO - recipient's email adress"
-   echo "SEND_EMAIL_SCRIPT_PATH - a path to the send email script (default: /etc/sg-send-email.sh)"
+   echo "Usage: $0 -l LOCAL_PATH -r REMOTE_PATH -f EMAIL_FROM -n EMAIL_NAME -t EMAIL_TO -s SEND_EMAIL_SCRIPT_PATH -p EMAIL_PROVIDER"
+   echo ""
+   echo "Required:"
+   echo "  -l LOCAL_PATH             Local path to sync"
+   echo "  -r REMOTE_PATH            Remote path in format remote:bucket/path"
+   echo "  -f EMAIL_FROM             Sender's email address"
+   echo "  -n EMAIL_NAME             Sender's name"
+   echo "  -t EMAIL_TO               Recipient's email address"
+   echo "  -p EMAIL_PROVIDER         Email provider: resend or sendgrid"
+   echo ""
+   echo "Optional:"
+   echo "  -s SEND_EMAIL_SCRIPT_PATH Path to the send email script (default: /etc/send-email.sh)"
 }
 
-while getopts "l:r:f:n:t:s:h" opt
+while getopts "l:r:f:n:t:s:p:h" opt
 do
    case $opt in
-      l)
-         local_path="${OPTARG}";;
-      r)
-         remote_path="${OPTARG}";;
-      f)
-         email_from="${OPTARG}";;
-      n)
-         email_name="${OPTARG}";;
-      t)
-         email_to="${OPTARG}";;
-      s)
-         send_email_script_path="${OPTARG}";;
+      l) local_path="${OPTARG}" ;;
+      r) remote_path="${OPTARG}" ;;
+      f) email_from="${OPTARG}" ;;
+      n) email_name="${OPTARG}" ;;
+      t) email_to="${OPTARG}" ;;
+      s) send_email_script_path="${OPTARG}" ;;
+      p) email_provider="${OPTARG}" ;;
       h)
          print_usage
-         exit 3
+         exit 0
+         ;;
+      *)
+         print_usage
+         exit 1
          ;;
    esac
 done
 
-# Check if script for sending emails is in place
-if [[ ! -f $send_email_script_path ]]; then
+# Validate required parameters
+if [[ -z "$local_path" || -z "$remote_path" || -z "$email_from" || -z "$email_name" || -z "$email_to" || -z "$email_provider" ]]; then
+    echo "Error: Missing required parameter(s)"
+    print_usage
+    exit 1
+fi
+
+# Validate email provider
+if [[ "$email_provider" != "resend" && "$email_provider" != "sendgrid" ]]; then
+    echo "Error: Invalid email provider '$email_provider'. Use 'resend' or 'sendgrid'"
+    exit 1
+fi
+
+# Check if send-email script exists
+if [[ ! -f "$send_email_script_path" ]]; then
     echo "Script \"$send_email_script_path\" does not exist"
     exit 1
 fi
 
-# Run script and capture time and exit code
+# Run sync and capture start/end time and status
 start_time=$(date +'%Y-%m-%d %H:%M:%S')
-rclone sync ${local_path} ${remote_path} --log-file=/var/log/rclone-backup.log --log-level INFO
+rclone sync "${local_path}" "${remote_path}" --log-file=/var/log/rclone-backup.log --log-level INFO
 exit_code="$?"
 end_time=$(date +'%Y-%m-%d %H:%M:%S')
 
-# Send email notification with sync status
-email_message="Start time: ${start_time}\nEnd time: ${end_time}"
+# Prepare email
 status="SUCCESSFUL"
-
 if [[ $exit_code -ne 0 ]]; then
     status="FAILED"
 fi
 
-${send_email_script_path} -f ${email_from} -n ${email_name} -t ${email_to} -s "Backup sync to S3 status: ${status}" -m "${email_message}"
+email_message="Start time: ${start_time}\nEnd time: ${end_time}"
+
+# Send email
+"$send_email_script_path" \
+   -f "$email_from" \
+   -n "$email_name" \
+   -t "$email_to" \
+   -s "Backup sync to S3 status: $status" \
+   -m "$email_message" \
+   -p "$email_provider"
 
diff --git a/send-email.sh b/send-email.sh
new file mode 100755
index 0000000..5ac0f3e
--- /dev/null
+++ b/send-email.sh
@@ -0,0 +1,129 @@
+#!/usr/bin/bash
+
+script_dir="$(dirname "$0")"
+default_resend_key_file="$script_dir/rs_key"
+default_sendgrid_key_file="$script_dir/sg_key"
+
+# Default values
+email_from=""
+email_name=""
+email_to=""
+subject=""
+message=""
+provider=""
+key_file=""
+
+print_usage () {
+   echo "Usage: $0 -f EMAIL_FROM -n EMAIL_NAME -t EMAIL_TO -s SUBJECT -m MESSAGE -p PROVIDER [-k KEY_FILE]"
+   echo ""
+   echo "Required:"
+   echo "  -f EMAIL_FROM     Sender's email address"
+   echo "  -n EMAIL_NAME     Sender's name"
+   echo "  -t EMAIL_TO       Recipient's email address"
+   echo "  -s SUBJECT        Email subject"
+   echo "  -m MESSAGE        Email message"
+   echo "  -p PROVIDER       Email provider: 'resend' or 'sendgrid'"
+   echo ""
+   echo "Optional:"
+   echo "  -k KEY_FILE       Path to API key file (defaults: ./rs_key for resend, ./sg_key for sendgrid)"
+   echo ""
+}
+
+send_email_resend () {
+   full_from="${email_name} <${email_from}>"
+
+   maildata='{
+      "to": ["'"${email_to}"'"],
+      "from": "'"${full_from}"'",
+      "subject": "'"${subject}"'",
+      "text": "'"${message}"'"
+   }'
+
+   curl -X POST "https://api.resend.com/emails" \
+      -H "Authorization: Bearer $api_key" \
+      -H "Content-Type: application/json" \
+      -d "$maildata"
+}
+
+send_email_sendgrid () {
+   maildata='{
+      "personalizations": [{"to": [{"email": "'"${email_to}"'"}]}],
+      "from": {"email": "'"${email_from}"'", "name": "'"${email_name}"'"},
+      "subject": "'"${subject}"'",
+      "content": [{"type": "text/plain", "value": "'"${message}"'"}]
+   }'
+
+   curl -X POST "https://api.sendgrid.com/v3/mail/send" \
+      -H "Authorization: Bearer $api_key" \
+      -H "Content-Type: application/json" \
+      -d "$maildata"
+}
+
+while getopts "f:n:t:s:m:p:k:h" opt
+do
+   case $opt in
+      f) email_from="${OPTARG}" ;;
+      n) email_name="${OPTARG}" ;;
+      t) email_to="${OPTARG}" ;;
+      s) subject="${OPTARG}" ;;
+      m) message="${OPTARG}" ;;
+      p) provider="${OPTARG}" ;;
+      k) key_file="${OPTARG}" ;;
+      h)
+         print_usage
+         exit 0
+         ;;
+      *)
+         print_usage
+         exit 1
+         ;;
+   esac
+done
+
+# Validate required parameters
+if [[ -z "$email_from" || -z "$email_name" || -z "$email_to" || -z "$subject" || -z "$message" || -z "$provider" ]]; then
+   echo "Error: Missing required parameter(s)"
+   print_usage
+   exit 1
+fi
+
+# Validate provider
+if [[ "$provider" != "resend" && "$provider" != "sendgrid" ]]; then
+   echo "Error: Invalid provider '$provider'. Use 'resend' or 'sendgrid'"
+   exit 1
+fi
+
+# Default key file per provider if not specified
+if [[ -z "$key_file" ]]; then
+   if [[ "$provider" == "resend" ]]; then
+      key_file="$default_resend_key_file"
+   else
+      key_file="$default_sendgrid_key_file"
+   fi
+fi
+
+# Check key file validity
+if [[ ! -f "$key_file" ]]; then
+   echo "API key file \"$key_file\" does not exist"
+   exit 1
+fi
+
+if [[ "$(stat -c "%a" "$key_file")" != "400" ]]; then
+   echo "Unsafe API key file permissions (should be 400)"
+   exit 1
+fi
+
+if [[ "$(wc -l < "$key_file")" != "1" ]]; then
+   echo "Wrong API key format (file must contain exactly one line)"
+   exit 1
+fi
+
+api_key="$(cat "$key_file")"
+
+# Dispatch to appropriate send function
+if [[ "$provider" == "resend" ]]; then
+   send_email_resend
+else
+   send_email_sendgrid
+fi
+
diff --git a/sg-send-email.sh b/sg-send-email.sh
deleted file mode 100755
index 675f0a7..0000000
--- a/sg-send-email.sh
+++ /dev/null
@@ -1,70 +0,0 @@
-#!/usr/bin/bash 
-# Simple script to send email notifications via the Sendgrid API.
-
-# Default values
-email_from=""
-email_name=""
-email_to=""
-subject=""
-message=""
-sg_key_file="./sg_key"
-
-print_usage () {
-   echo "Usage: "$0" -f EMAIL_FROM -n EMAIL_NAME -t EMAIL_TO -s SUBJECT -m MESSAGE [-k SG_KEY_FILE]"
-   echo "EMAIL_FROM - sender's email address"
-   echo "EMAIL_NAME - sender's name"
-   echo "EMAIL_TO - recipient's email adress"
-   echo "SUBJECT - email subject"
-   echo "MESSAGE - email message"
-   echo "SG_KEY_FILE - a path to the file with Sendgrid API key (default: ./sg_key)"
-}
-
-send_email () {
-   maildata='{"personalizations": [{"to": [{"email": "'${email_to}'"}]}],"from": {"email": "'${email_from}'",
-   "name": "'${email_name}'"},"subject": "'${subject}'","content": [{"type": "text/plain", "value": "'${message}'"}]}'
-   
-   curl -X "POST" "https://api.sendgrid.com/v3/mail/send" \
-      -H "Authorization: Bearer $sg_key" \
-      -H "Content-Type: application/json" \
-      -d "$maildata"
-}
-
-while getopts "f:n:t:s:m:k:h" opt
-do
-   case $opt in
-      f)
-         email_from="${OPTARG}";;
-      n)
-         email_name="${OPTARG}";;
-      t)
-         email_to="${OPTARG}";;
-      s)
-         subject="${OPTARG}";;
-      m)
-         message="${OPTARG}";;
-      k)
-         sg_key_file="${OPTARG}";;
-      h)
-         print_usage
-         exit 3
-         ;;
-   esac
-done
-
-if [[ ! -f $sg_key_file ]]; then
-    echo "API key file \"$sg_key_file\" does not exist"
-    exit 1
-fi
-
-if [[ "$(stat -c "%a" $sg_key_file)" != "400" ]]; then
-    echo "Unsafe API key file permissions"
-    exit 1
-fi
-
-if [[ "$(wc -l $sg_key_file | cut -d" " -f1)" != "1" ]]; then
-   echo "Wrong API key format"
-   exit 1
-fi
-
-sg_key="$(cat $sg_key_file)"
-send_email