i have create business email in my cpanel but not work

you add business email like info@mysite.com

but it not work

hosting server provider is provide email services so that your domain and hosting different services provider then you need to add some records in domain account

your domain and hosting server same services provider then it add automatic MX records

I am assume you have create your business email

step 1 : login your account  domain register account

step 2 : then goto manage domain setting there different type of dns record you need to add MX (mail exchange ) record

so

you using google business email so that you add google MX record

all service provider provide the MX or all type of record info in user guide or FAQ page

 

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i have add subdomain but it not work how to solve it

first you need to access your register domain account

domain name records called (DNS record ) show one main domain with add DNS A record

all domain or subdomain  required to point with host
A record point to your hosting server

step 1 : create sub domain in hosting cpanel

step 2 : goto your domain register account
step 3 : goto DNS zone file

showing example is godaddy cpanel

  

your host name is subdomain name

Host -> subdomain name
Point to -> server ip

TTL use default or custom

Fatal error: Allowed memory size of 67108864 bytes exhausted wordpress

Fatal error: Allowed memory size of 67108864 bytes exhausted wordpress

open your file manager
then goto wordpress directory wp-include -> then   default-constants.php

change a memory size values
64 to 256 or your need

modifications see below light blue color  in default-constants.php  

<?php
/**
 * Defines constants and global variables that can be overridden, generally in wp-config.php.
 *
 * @package WordPress
 */
/**
 * Defines initial WordPress constants
 *
 * @see wp_debug_mode()
 *
 * @since 3.0.0
 *
 * @global int $blog_id
 */
function wp_initial_constants() {
 global $blog_id;
 /**#@+
  * Constants for expressing human-readable data sizes in their respective number of bytes.
  *
  * @since 4.4.0
  */
 define( ‘KB_IN_BYTES’, 1024 );
 define( ‘MB_IN_BYTES’, 1024 * KB_IN_BYTES );
 define( ‘GB_IN_BYTES’, 1024 * MB_IN_BYTES );
 define( ‘TB_IN_BYTES’, 1024 * GB_IN_BYTES );
 /**#@-*/
 $current_limit     = @ini_get( ‘memory_limit’ );
 $current_limit_int = wp_convert_hr_to_bytes( $current_limit );
 // Define memory limits.
 if ( ! defined( ‘WP_MEMORY_LIMIT’ ) ) {
  if ( false === wp_is_ini_value_changeable( ‘memory_limit’ ) ) {
   define( ‘WP_MEMORY_LIMIT’, $current_limit );
  } elseif ( is_multisite() ) {
   define( ‘WP_MEMORY_LIMIT’, ‘512M’ );
  } else {
   define( ‘WP_MEMORY_LIMIT’, ‘128M’ );
  }

 }
 if ( ! defined( ‘WP_MAX_MEMORY_LIMIT’ ) ) {
  if ( false === wp_is_ini_value_changeable( ‘memory_limit’ ) ) {
   define( ‘WP_MAX_MEMORY_LIMIT’, $current_limit );
  } elseif ( -1 === $current_limit_int || $current_limit_int > 268435456 /* = 512M */ ) {
   define( ‘WP_MAX_MEMORY_LIMIT’, $current_limit );
  } else {
   define( ‘WP_MAX_MEMORY_LIMIT’, ‘512M’ );
  }

 }