added mailify v.1.0.0

Signed-off-by: adarsh-jaiss <its.adarshjaiss@gmail.com>

CODEOWNERS

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+@Adarsh-jaiss

README.md

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+# Mailify
+
+Mailify is a Go package for validating email addresses by checking their format, verifying the existence of MX records for the domain, and attempting to connect to the mail servers using SMTP.
+
+## Installation
+
+To install the package, run:
+
+```sh
+go get github.com/adarsh-jaiss/mailify
+
+```
+
+## Usage
+
+### Creating a Client
+
+To create a new client, use the NewClient function:
+
+```go
+client, err := mailify.NewClient("sender@example.com")
+if err != nil {
+    log.Fatalf("Failed to create mailify client: %v", err)
+}
+```
+
+### Validating an Email Address
+
+To validate an email address, use the ValidateEmail method:
+
+```go
+result, err := client.ValidateEmail("recipient@example.com")
+if err != nil {
+    log.Fatalf("Failed to validate email: %v", err)
+}
+
+fmt.Println("Validation result:", client.FormatValidationResult("recipient@example.com", result))
+```
+
+### Getting Mail Servers
+To get the mail servers for a domain, use the GetMailServers method:
+
+```go
+mailServers, err := client.GetMailServers("example.com")
+if err != nil {
+    log.Fatalf("Failed to get mail servers: %v", err)
+}
+
+fmt.Println("Mail servers:", mailServers)
+```
+
+To get the mail servers for a recipient email, use the GetMailServersFromReceipientEmail method:
+
+```go
+
+mailServers, err := client.GetMailServersFromReceipientEmail("recipient@example.com")
+if err != nil {
+    log.Fatalf("Failed to get mail servers: %v", err)
+}
+
+fmt.Println("Mail servers:", mailServers)
+```
+
+### Example
+Here is a complete example demonstrating how to use the package : [check examples]()

client.go

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+package mailify
+
+// 
+// Client represents an email client with a sender email address.
+type Client struct {
+	SenderEmail string
+}
+
+// NewClient creates a new Client instance with the provided sender email address.
+// It returns a pointer to the Client and an error, if any.
+//
+// Parameters:
+//   - SenderEmail: A string representing the sender's email address.
+//
+// Returns:
+//   - *Client: A pointer to the newly created Client instance.
+//   - error: An error if there is any issue during the creation of the Client.
+func NewClient(SenderEmail string) (*Client, error) {
+	return &Client{
+		SenderEmail: SenderEmail,
+	}, nil
+}
+

examples/main.go

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+package main
+
+import (
+	"log"
+	"fmt"
+
+	"github.com/adarsh-jaiss/mailify"
+)
+
+func main() {
+	// Create a new mailguard client
+	senderEmail := "its.adarshjaiss@gmail.com"
+	receipientEmail := "hello@namanrai.tech"
+
+	client, err := mailify.NewClient(senderEmail)
+	if err != nil {
+		log.Fatalf("Failed to create mailguard client: %v", err)
+	}
+
+	// Get mail servers for a domain
+	resp, err := client.GetMailServers("namanrai.tech")
+	if err != nil {
+		log.Fatalf("Failed to get mail servers: %v", err)
+	}
+	log.Println("Mail servers:", resp)
+
+	// Get mail servers for a recepient email
+	res, err := client.GetMailServersFromReceipientEmail(receipientEmail)
+	if err != nil {
+		log.Fatalf("Failed to get mail servers: %v", err)
+	}
+	log.Println("Mail servers:", res)
+
+	// Validate an email address
+	result, err := client.ValidateEmail(receipientEmail)
+	if err!= nil {
+		log.Fatalf("Failed to validate email: %v", err)
+	}
+
+	fmt.Println("Validation result:", client.FormatValidationResult(receipientEmail,result))
+
+}

go.mod

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+module github.com/adarsh-jaiss/mailify
+
+go 1.22.1

servers.go

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+package mailify
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"strings"
+	"time"
+)
+
+// GetMailServers retrieves the mail servers (MX records) for a given domain.
+// It uses a custom DNS resolver that queries Google's public DNS server (8.8.8.8).
+
+// Parameters:
+//   - domain: The domain name for which to look up MX records.
+
+// Returns:
+//   - A slice of strings containing the mail server hostnames.
+//   - An error if there was an issue looking up the MX records.
+
+// Example:
+//   mailServers, err := GetMailServers("example.com")
+//   if err != nil {
+//       log.Fatalf("Failed to get mail servers: %v", err)
+//   }
+//   fmt.Println("Mail servers:", mailServers)
+
+func(c *Client) GetMailServers(domain string) ([]string, error) {
+	// Use custom DNS resolver to query Google's public DNS server
+
+	resolver := net.Resolver{
+		PreferGo: true,
+		Dial: func(ctx context.Context, network, address string) (net.Conn, error) {
+			d := net.Dialer{}
+			return d.DialContext(ctx, network, "8.8.8.8:53") // Use Google DNS
+		},
+	}
+
+	// Lookup MX records for the domain
+	mx, err := resolver.LookupMX(context.Background(), domain)
+	// mx, err := net.LookupMX(domain)
+	if err != nil {
+		return nil, fmt.Errorf("error looking up MX records: %v", err)
+	}
+
+	// Extract mail server hostnames
+	var mailServers []string
+	for _, record := range mx {
+		mailServers = append(mailServers, strings.TrimSuffix(record.Host, "."))
+	}
+
+	// Print mail servers
+	// fmt.Printf("Found mail servers for %s: %v\n", domain, mailServers)
+	return mailServers, nil
+}
+
+// GetSMTPServer attempts to find an available SMTP server for the given mail server.
+// It performs a DNS lookup to get all IP addresses (both IPv4 and IPv6) associated with the mail server,
+// and then tries to connect to common SMTP ports (587, 25, 465) on each IP address.
+//
+// If a connection is successfully established, it returns the SMTP server details including
+// the server name, port, protocol, and IP address. If no available SMTP servers are found,
+// it returns an error.
+//
+// Parameters:
+//   - mailServer: The domain name of the mail server to look up.
+//
+// Returns:
+//   - *SMTPDetails: A struct containing the details of the SMTP server if found.
+//   - error: An error if no available SMTP servers are found or if there is a lookup failure.
+func(c *Client) GetSMTPServer(mailServer string) (*SMTPDetails, error) {
+	// Get all IPs (both IPv4 and IPv6)
+	ips, err := net.LookupIP(mailServer)
+	if err != nil {
+		return nil, fmt.Errorf("failed to lookup IP for %s: %v", mailServer, err)
+	}
+
+	// Try each IP address
+	for _, ip := range ips {
+		// Try common SMTP ports
+		ports := []string{"587", "25", "465"}
+		for _, port := range ports {
+			// Format address based on IP version
+			var address string
+			if ip.To4() != nil {
+				// IPv4
+				address = fmt.Sprintf("%s:%s", ip.String(), port)
+			} else {
+				// IPv6 - wrap in square brackets
+				address = fmt.Sprintf("[%s]:%s", ip.String(), port)
+			}
+
+			// Set timeout for connection
+			smtpTimeout := time.Duration(time.Second * 5)
+
+			// Try to connect
+			conn, err := net.DialTimeout("tcp", address, smtpTimeout)
+			if err != nil {
+				continue
+			}
+			defer conn.Close()
+
+			return &SMTPDetails{
+				Server:    mailServer,
+				Port:      port,
+				Protocol:  "SMTP",
+				IPAddress: ip.String(),
+			}, nil
+		}
+	}
+	return nil, fmt.Errorf("no available SMTP servers found for %s", mailServer)
+}
+
+// GetMailServersFromReceipientEmail extracts the domain from the given email address
+// and retrieves the mail servers associated with that domain.
+//
+// Parameters:
+//   email (string): The recipient's email address.
+//
+// Returns:
+//   []string: A slice of mail server addresses.
+//   error: An error object if there was an issue extracting the domain or retrieving the mail servers.
+func(c *Client) GetMailServersFromReceipientEmail(email string) ([]string, error) {
+	// Extract domain from email address
+	domain,err := c.ExtractDomainFromEmailAddress(email)
+	if err != nil {
+		return nil, fmt.Errorf("error extracting domain from email address: %v", err)
+	}
+
+	return c.GetMailServers(domain)
+}

types.go

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+package mailify
+
+
+// SMTPDetails holds the details required to connect to an SMTP server.
+type SMTPDetails struct {
+	// Server is the address of the SMTP server.
+	Server string
+	// Port is the port number on which the SMTP server is listening.
+	Port string
+	// Protocol is the protocol used by the SMTP server (e.g., "SMTP", "SMTPS").
+	Protocol string
+	// UsedTLS indicates whether TLS is used for the connection.
+	UsedTLS bool
+	// IPAddress is the IP address of the SMTP server.
+	IPAddress string
+}
+
+// ValidationResult represents the result of an email validation check.
+type ValidationResult struct {
+	// IsValid indicates whether the email address is valid.
+	IsValid bool
+	// IsCatchAll indicates whether the domain has a catch-all address.
+	IsCatchAll bool
+	// HasMX indicates whether the domain has MX records.
+	HasMX bool
+	// ErrorMessage contains any error message encountered during validation.
+	ErrorMessage string
+	// SMTPDetails contains the SMTP server details used for validation.
+	SMTPDetails *SMTPDetails
+}
+