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Postfix SMTP Server Upwork freelancers typically receive a client rating of 4.80.

Last updated: October 1, 2015

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Oleksii A.

JavaSE/JavaEE Developer, PhD in Information Security

Ukraine - Tests: 5

Enterprise and Web Application Developer. PhD in Information Security. Especially interested in building complex (transactional, concurrent, secured, scalable etc) Java/J2EE based systems. Strive for creating systems based on sound technical designs by applying OO design concepts and software patterns.

$38.89 /hr
1,277 hours

Alexandru V.

Alexandru V.

Senior Linux Administrator

Romania - Tests: 4 - Portfolio: 2

* Fully manage the installation, configuration and troubleshooting of Linux servers * Install and configure Web Servers and MySQL * Install and configure customer scripts and programs * Monitor performance to identify and resolve issues using a suite of systems and tools. * Troubleshoot and resolve network, system, hardware and software problems. * Achieve quick fixes and / or long-term solutions as needed. * Maintain 100% customer satisfaction through all available means.

100% Job Success
$20.00 /hr
126 hours

ArunKumar S

ArunKumar S

Linux System Administrator

India - Tests: 3 - Portfolio: 1

Over the last 4 years, I've worked with two different Web Hosting support companies, where I had to handle cPanel/WHM, Virtualmin/Webmin, Direct admin, Zpanel, Plesk (basic windows hosting), Apache/Litespeed, MySQL, basic PHP, Exim, DNS(bind9), Zimbra and many other applications and cloud servers. Has experience in setting up and managing cPanel based CloudLinux servers with all the server hardening and also know the basics of bash scripting. Have experience in both voice and ticket support system (WHMCS, Kayako, OsTicket etc). Can handle tickets with least response time and with good technical resolution and customer satisfaction since I'm having another 8 months of experience in BPO voice support for a Multi National Company. I've experience and have configured R1 soft backup for cPanel accounts, duplicity backups etc. I also have experience in setting up Linux servers, installing custom scripts, hardening the server etc. I also have knowledge in OpenVZ, Xen and VMware virtualization. Has experience in configuring the said virtualizations. I'm an expert in Nagios monitoring and with various other monitoring tools like Zabbix. TECHNICAL DATA SUMMARY: -COMPLETE LINUX SERVER MAINTENANCE/TROUBLESHOOTING (RHEL, CentOS, Debian, Ubuntu) -VIRTUALIZATION: (Vmware, Openvz, Virtuozzo, Xen, KVM, vserver) -CLOUD HOSTING (Amazon EC2, AWS, S3) -NETWORKING (DHCP,DNS:powerdns/bind/named)VPN: openvpn/pptp FIREWALL: iptables/ipfw, qos, proxies -WEB SERVERS (Apache, Nginx, Lighttpd, Tomcat) -MAIL SERVERS (Exim, Postfix, Qmail, antispam/ antivirus:clamav/spamassassin/amavis, courier, dovecot), -BULK MARKETING (Dkim, spf, high speed/inboxing) -MONITORING (zabbix, Nagios ) -HOSTING CONTROL PANELS (Cpanel/WHM, Plesk, DirectAdmin, Zpanel, Virtualmin) -MIGRATIONS/TRANSFERS (Websites, Emails and Application migrations with zero or no downtime guaranteed) CUSTOMER/CLIENT GENERAL WORK NATURE SUMMARY: -Always available in case of emergency just a ring away(Has both Mobile and land line number). -Has setup multiple monitors in twin view mode which helps to multitask easily and helps in reducing the ticket response times. -Experience in BPO Customer Support/service has improved my customer satisfaction skills. I always believe in the fact that a Customer is always the king. -Fast and reliable internet connection with a standby emergency WiFi network. -Two laptops(Ubuntu and Windows) and a desktop in case of emergency. -Flexible work hours and is ready to work on weekends too. -Trustworthy and transparent work. -Will provide daily shift reports in a well formatted way. You just leave the SERVERS to me to handle/manage and go and grab a drink!!!!!

100% Job Success
$7.78 /hr
41 hours

Ashwin M.

Ashwin M.

Expert Email & Web Consultant

India - Tests: 4 - Portfolio: 1

Experienced Systems Engineer with deep knowledge in Web Administration, Mail Servers, Database Administration, High Availability, and Optimization. Server performance optimization and security implementation. I specialize in Mail Servers : Handling PMTA, Interspire, Blacklisting, Feedback Loops, Increase open and CTR. I have been designing infra for top notch companies, I am responsible for Email Delivery, and other factors like SPF, DKIM, DMARC, FBL, getting Open rates, SPAM Issues, Bounce Processing required for perfect email solution. Web Technologies, i've been working for busiest top 10 websites, Expertise on all the three layers - OS - Network - Application.

55% Job Success
$25.00 /hr
39 hours

Priyaranjan Sahu

Priyaranjan Sahu

Expert in Linux and Windows server administration.

India - Tests: 6 - Portfolio: 19

--> DNS management (Registrar end and Hosting end), --> Mail Services (Postfix, Qmail, Exim, Mail enable, Exchange), --> FTP Services (Proftpd, PureFTP,VSFTP), --> Plesk Panel (Windows and Linux), --> Cpanel (Linux) and Enkompass (Windows), --> Virtuoozzo (VPS, Linux and Windows), --> Webmail (Roundcube, Horde, Squirrel, Atmail), --> Database (MySQL, MSSQL, Jet) --> Statistics analysers (Awstats, Webalizer and etc) --> SPAM checkers (Spamassasin, Boxtrapper) --> Network Administration (CCNA, Linux and Windows) --> Webservers (Apache, Nginx, IIS) --> CMS (Wordpress, Joomla, Magento, PHPFox, Wiki, Forums, Drupal) --> Technical SEO with speed optimisation from server end. --> Scripts installation (PHP, Perl, Shell) --> Server Hardening. --> Installation of Softwares on a server environment. --> Migration and setup of websites with minimum downtime. --> Technical article writing. --> Active Directory. --> Lync Server. ---> Parallels Operations Automation. --> Parallels Business Automation. I am glad to provide Technical help related with Servers both Linux and Windows as well as technical help related with wordpress, Joomla, Magento, Drupal and SEO optimizations. I have worked with Parallels Products like Virtuoozzo, Plesk and also worked with Cpanel from the past 3 years totally dedicated. I am an expert in Web-hosting industry. I am also an expert in Network administration. Please check my Blog for some solutions:

84% Job Success
$22.22 /hr
21 hours

Chris Rivas

Chris Rivas

Hosting Industry Sr Linux Admin w/ RHCE, RHCVA, MySQL DBA, developer

United States - Tests: 7 - Portfolio: 1

For more than ten years I have worked extensively in the software development and hosting industries. I am an expert Linux and Unix system engineer, and can deploy and configure any software stack that is based on Linux for optimal content delivery. I excel at MySQL database design, optimization, and administration. I am a seasoned software developer and have extensive experience with many languages including Java, Python, PHP and Ruby. I also have significant experience with customizing, deploying, and adminstering open source web applications, application frameworks, and application servers. I have worked locally, overseas, and with colleagues and clients overseas via the internet. If you look at my work history here, you will note that i 'disappeared' in February 2011. Indeed I did disappear, I was in a very bad car accident in Bangkok, Thailand, where I was living at the time, and was nto able to get out of bed or use a phone or computer for roughly a month. I now reside in Austin, TX again full-time I do not disappear typically, my present and previous employers can confirm that if you are hesitant based on feedback from 2011.

$36.67 /hr
22 hours

Roberto Murillo

Roberto Murillo

Computers and Servers Technical Support

Honduras - Tests: 3

1. I have knowledge working with graphics environment Linux Systems and terminals with different Linux distributions (CentOS, Fedora, Ubuntu, Debian, Kubuntu). 2. I know how to configure GNU / Linux Web Administration's interface (Webmin). 3. I have knowledge working with Windows Operating System (Installation, Update & Configuration, etc.). 4. I can give Hardware Technical Support with Personal Computers or Servers (changes Motherboards, Processors, Graphics Cards, Memory RAM, etc.). 5. I can work with installation, configuration and upgrade BIOS. 6. I have Web Programming Knowledge with HTML/XHTML, CSS, and PHP. 7. In working with Linux systems, I can install, upgrade and configure different services to Servers GNU / Linux, such as Samba, Postfix SMTP, Dovecot IMAP/POP3, DHCP Server, Apache HTTP, Shorewall Firewall, SSH, Telnet, and more.

80% Job Success
$7.78 /hr
147 hours

Muhammad Attique

Muhammad Attique

InfoSec Expert, Ethical Hacker, Penetration Tester, Security Analyst

Pakistan - Tests: 12 - Portfolio: 6

Provide efficient and timely solutions in Network / System Administration and Information Security. In-depth knowledge and expertise in Ethical Hacking, Penetration Testing and Securing Perimeter. Keep myself up-to date with latest InfoSec. technologies, tools, vulnerabilities and their solutions ASAP.

53% Job Success
$16.67 /hr
4 hours

Oscar Bass

Oscar Bass Agency Contractor

Senior UNIX System Engineer, LAMP, LEMP, Network Security, Cloud.

United States - Tests: 7 - Portfolio: 1

Expert UNIX system administrator and network engineer. Got a problem? I can solve it! For more than 15 years I have been the I.T. backbone and support for many online companies. I use the most up to date standards for any project I am involved in. I work extremely quick and efficiently. If you have a problem let me help you solve it. OS: Linux - Expert, FreeBSD - Expert, AIX - Expert, HP-UX - Expert, Macintosh OS/X - Expert, Windows Server - Proficient Cloud services: AWS, Rackspace, OpSource, Linode Web servers: Apache, Nginx, Tomcat Database servers: Mysql, Postgresql Monitoring: Nagios, Monit, Munin, Cacti Scripting: bash, perl, shell Virtualization: OpenVZ, Xen, SolusVM Mail servers: Postfix, Exim, Sendmail, Dovecot Control panels: cPanel, Plesk, Direct Admin, Webmin/Virtualmin, ISPconfig, OpenPanel Other: standard network services (DNS, DHCP, LDAP, Samba, SVN/Git, http proxy, jabber, backups, monitoring etc), firewalls (iptables, ipfw, pf)

Associated with: Bass Designs Agency

78% Job Success
$55.56 /hr
328 hours

Maxim Sheremet

100% Job Success
$27.78 /hr
13,247 hours