diff --git a/install.sh b/install.sh
index 3c0c8a9..f7ac2c9 100644
--- a/install.sh
+++ b/install.sh
@@ -1,108 +1,214 @@
-#!/usr/bin/env bash
+#!/bin/sh
 
-GH_REPO="axllent/mailpit"
-TIMEOUT=90
-INSTALL_PATH="${INSTALL_PATH:-/usr/local/bin}"
+# This script will install the latest release of Mailpit.
 
-set -e
+# Check dependencies is installed
+for cmd in curl tar; do
+    if ! command -v "$cmd" >/dev/null 2>&1; then
+        echo "Then $cmd command is required but not installed."
+        echo "Please install $cmd and try again."
+        exit 1
+    fi
+done
 
-VERSION=$(curl --silent --fail --location --max-time "${TIMEOUT}" "https://api.github.com/repos/${GH_REPO}/releases/latest" | grep '"tag_name":' | sed -E 's/.*"([^"]+)".*/\1/')
-if [ $? -ne 0 ]; then
-    echo -ne "\nThere was an error trying to check what is the latest version of Mailpit.\nPlease try again later.\n"
-    exit 1
-fi
-
-# detect the platform
-OS="$(uname)"
-case $OS in
-Linux)
-    OS='linux'
-    ;;
-FreeBSD)
-    OS='freebsd'
-    echo 'OS not supported'
-    exit 2
-    ;;
-NetBSD)
-    OS='netbsd'
-    echo 'OS not supported'
-    exit 2
-    ;;
-OpenBSD)
-    OS='openbsd'
-    echo 'OS not supported'
-    exit 2
-    ;;
-Darwin)
-    OS='darwin'
-    ;;
-SunOS)
-    OS='solaris'
-    echo 'OS not supported'
-    exit 2
-    ;;
+# Check if the OS is supported.
+OS=
+case "$(uname -s)" in
+Linux) OS="linux" ;;
+Darwin) OS="Darwin" ;;
 *)
-    echo 'OS not supported'
+    echo "OS not supported."
     exit 2
     ;;
 esac
 
-# detect the arch
-OS_type="$(uname -m)"
-case "$OS_type" in
+# Detect the architecture of the OS.
+OS_ARCH=
+case "$(uname -m)" in
 x86_64 | amd64)
-    OS_type='amd64'
+    OS_ARCH="amd64"
     ;;
 i?86 | x86)
-    OS_type='386'
+    OS_ARCH="386"
     ;;
 aarch64 | arm64)
-    OS_type='arm64'
+    OS_ARCH="arm64"
     ;;
 *)
-    echo 'OS type not supported'
+    echo "OS architecture not supported."
     exit 2
     ;;
 esac
 
-GH_REPO_BIN="mailpit-${OS}-${OS_type}.tar.gz"
+GH_REPO="axllent/mailpit"
+INSTALL_PATH="${INSTALL_PATH:-/usr/local/bin}"
+TIMEOUT=90
+# This is used to authenticate with the GitHub API. (Fix the public rate limiting issue)
+# Try the GITHUB_TOKEN environment variable is set globally.
+GITHUB_API_TOKEN="${GITHUB_TOKEN:-}"
 
-#create tmp directory and move to it with macOS compatibility fallback
-tmp_dir=$(mktemp -d 2>/dev/null || mktemp -d -t 'mailpit-install.XXXXXXXXXX')
-cd "$tmp_dir"
+# Update the default values if the user has set.
+while [ $# -gt 0 ]; do
+    case $1 in
+    --install-path)
+        shift
+        case "$1" in
+        */*)
+            # Remove trailing slashes from the path.
+            INSTALL_PATH="$(echo "$1" | sed 's#/\+$##')"
+            [ -z "$INSTALL_PATH" ] && INSTALL_PATH="/"
+            ;;
+        esac
+        ;;
+    --auth | --auth-token | --github-token | --token)
+        shift
+        case "$1" in
+        gh*)
+            GITHUB_API_TOKEN="$1"
+            ;;
+        esac
+        ;;
+    *) ;;
+    esac
+    shift
+done
 
-echo "Downloading Mailpit $VERSION"
-LINK="https://github.com/${GH_REPO}/releases/download/${VERSION}/${GH_REPO_BIN}"
+# Description of the sort parameters for curl command.
+# -s: Silent mode.
+# -f: Fail silently on server errors.
+# -L: Follow redirects.
+# -m: Set maximum time allowed for the transfer.
 
-curl --silent --fail --location --max-time "${TIMEOUT}" "${LINK}" -o "${GH_REPO_BIN}" || {
-    echo "Error downloading latest release"
-    exit 2
-}
+if [ -n "$GITHUB_API_TOKEN" ] && [ "${#GITHUB_API_TOKEN}" -gt 36 ]; then
+    CURL_OUTPUT="$(curl -sfL -m $TIMEOUT -H "Authorization: Bearer $GITHUB_API_TOKEN" https://api.github.com/repos/${GH_REPO}/releases/latest)"
+    EXIT_CODE=$?
+else
+    CURL_OUTPUT="$(curl -sfL -m $TIMEOUT https://api.github.com/repos/${GH_REPO}/releases/latest)"
+    EXIT_CODE=$?
+fi
 
-tar zxf "$GH_REPO_BIN" || {
-    echo "Error extracting ${GH_REPO_BIN}"
-    exit 2
-}
-
-mkdir -p "${INSTALL_PATH}" || exit 2
-cp mailpit "${INSTALL_PATH}" || exit 2
-chmod 755 "${INSTALL_PATH}/mailpit" || exit 2
-case "$OS" in
-'linux')
-    if [ "$(id -u)" -eq "0" ]; then
-        chown root:root "${INSTALL_PATH}/mailpit" || exit 2
+VERSION=""
+if [ $EXIT_CODE -eq 0 ]; then
+    # Extracts the latest version using jq, awk, or sed.
+    if command -v jq >/dev/null 2>&1; then
+        # Use jq -n because the output is not a valid JSON in sh.
+        VERSION=$(jq -n "$CURL_OUTPUT" | jq -r '.tag_name')
+    elif command -v awk >/dev/null 2>&1; then
+        VERSION=$(echo "$CURL_OUTPUT" | awk -F: '$1 ~ /tag_name/ {gsub(/[^v0-9\.]+/, "", $2) ;print $2; exit}')
+    elif command -v sed >/dev/null 2>&1; then
+        VERSION=$(echo "$CURL_OUTPUT" | sed -n 's/.*"tag_name": *"\([^"]*\)".*/\1/p')
+    else
+        EXIT_CODE=3
     fi
-    ;;
-'freebsd' | 'openbsd' | 'netbsd' | 'darwin')
-    if [ "$(id -u)" -eq "0" ]; then
-        chown root:wheel "${INSTALL_PATH}/mailpit" || exit 2
-    fi
-    ;;
+fi
+
+# Validate the version.
+case "$VERSION" in
+v[0-9][0-9\.]*) ;;
 *)
-    echo 'OS not supported'
-    exit 2
+    echo "There was an error trying to check what is the latest version of Mailpit."
+    echo "Please try again later."
+    exit $EXIT_CODE
     ;;
 esac
 
-rm -rf "$tmp_dir"
-echo "Installed successfully to ${INSTALL_PATH}/mailpit"
+TEMP_DIR="$(mktemp -qd)"
+EXIT_CODE=$?
+# Ensure the temporary directory exists and is a directory.
+if [ -z "$TEMP_DIR" ] || [ ! -d "$TEMP_DIR" ]; then
+    echo "ERROR: Creating temporary directory."
+    exit $EXIT_CODE
+fi
+
+GH_REPO_BIN="mailpit-${OS}-${OS_ARCH}.tar.gz"
+if [ "$INSTALL_PATH" = "/" ]; then
+    INSTALL_BIN_PATH="/mailpit"
+else
+    INSTALL_BIN_PATH="${INSTALL_PATH}/mailpit"
+fi
+cd "$TEMP_DIR" || EXIT_CODE=$?
+if [ $EXIT_CODE -eq 0 ]; then
+    # Download the latest release.
+    #
+    # Description of the sort parameters for curl command.
+    # -s: Silent mode.
+    # -f: Fail silently on server errors.
+    # -L: Follow redirects.
+    # -m: Set maximum time allowed for the transfer.
+    # -o: Write output to a file instead of stdout.
+    curl -sfL -m $TIMEOUT -o "${GH_REPO_BIN}" "https://github.com/${GH_REPO}/releases/download/${VERSION}/${GH_REPO_BIN}"
+    EXIT_CODE=$?
+
+    # The following conditions check each step of the installation.
+    # If there is an error in any of the steps, an error message is printed.
+
+    if [ $EXIT_CODE -eq 0 ]; then
+        if ! [ -f "${GH_REPO_BIN}" ]; then
+            EXIT_CODE=1
+            echo "ERROR: Downloading latest release."
+        fi
+    fi
+
+    if [ $EXIT_CODE -eq 0 ]; then
+        tar zxf "$GH_REPO_BIN"
+        EXIT_CODE=$?
+        if [ $EXIT_CODE -ne 0 ]; then
+            echo "ERROR: Extracting \"${GH_REPO_BIN}\"."
+        fi
+    fi
+
+    if [ $EXIT_CODE -eq 0 ] && [ ! -d "$INSTALL_PATH" ]; then
+        mkdir -p "${INSTALL_PATH}"
+        EXIT_CODE=$?
+        if [ $EXIT_CODE -ne 0 ]; then
+            echo "ERROR: Creating \"${INSTALL_PATH}\" directory."
+        fi
+    fi
+
+    if [ $EXIT_CODE -eq 0 ]; then
+        cp mailpit "$INSTALL_BIN_PATH"
+        EXIT_CODE=$?
+        if [ $EXIT_CODE -ne 0 ]; then
+            echo "ERROR: Copying mailpit to \"${INSTALL_PATH}\" directory."
+        fi
+    fi
+
+    if [ $EXIT_CODE -eq 0 ]; then
+        chmod 755 "$INSTALL_BIN_PATH"
+        EXIT_CODE=$?
+        if [ $EXIT_CODE -ne 0 ]; then
+            echo "ERROR: Setting permissions for \"$INSTALL_BIN_PATH\" binary."
+        fi
+    fi
+
+    # Set the owner and group to root:root if the script is run as root.
+    if [ $EXIT_CODE -eq 0 ] && [ "$(id -u)" -eq "0" ]; then
+        OWNER="root"
+        GROUP="root"
+        # Set the OWNER, GROUP variable when the OS not use the default root:root.
+        case "$OS" in
+        darwin) GROUP="wheel" ;;
+        *) ;;
+        esac
+
+        chown "${OWNER}:${GROUP}" "$INSTALL_BIN_PATH"
+        EXIT_CODE=$?
+        if [ $EXIT_CODE -ne 0 ]; then
+            echo "ERROR: Setting ownership for \"$INSTALL_BIN_PATH\" binary."
+        fi
+    fi
+else
+    echo "ERROR: Changing to temporary directory."
+    exit $EXIT_CODE
+fi
+
+# Cleanup the temporary directory.
+rm -rf "$TEMP_DIR"
+# Check the EXIT_CODE variable, and print the success or error message.
+if [ $EXIT_CODE -ne 0 ]; then
+    echo "There was an error installing Mailpit."
+    exit $EXIT_CODE
+fi
+
+echo "Installed successfully to \"$INSTALL_BIN_PATH\"."
+exit 0