Dec 29, 2023: iRedMail-1.6.8 has been released.

**admin@dpl.net.in** · 2015-05-02 15:34:45

admin@dpl.net.in
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From: Durgapur, India
Registered: 2015-04-21
Posts: 26

Topic: Android Email client/Mail sending through JAVA issue

==== Required information ====
- iRedMail version: 0.9.0
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Web server (Apache or Nginx):Apache2
- Linux/BSD distribution name and version: Ubuntu 14.04
- Related log if you're reporting an issue:
====

We are using the Iredmail over web access but we are facing issues while configuring the standard Android client for our mail server.

We are entering the static IP/Domain name for both pop3 and SMTP
Security Type - We have tried all possible combinations (STARTTLS,SSL/TLS)

We are getting an error like this-" Could not open connection to the server"

Further, while sending any mail grammatically through Java mail API, we are getting the following error message:

Exception in thread "main" java.lang.RuntimeException: javax.mail.MessagingException: Could not connect to SMTP host: thedpl.in, port: 587;
nested exception is:
java.net.ConnectException: Connection refused: connect
at utility.SendMailAttachmentDPL.main(SendMailAttachmentDPL.java:91)
Caused by: javax.mail.MessagingException: Could not connect to SMTP host: thedpl.in, port: 587;
nested exception is:
java.net.ConnectException: Connection refused: connect
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1934)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:638)
at javax.mail.Service.connect(Service.java:317)
at javax.mail.Service.connect(Service.java:176)
at javax.mail.Service.connect(Service.java:125)
at javax.mail.Transport.send0(Transport.java:194)
at javax.mail.Transport.send(Transport.java:124)
at utility.SendMailAttachmentDPL.main(SendMailAttachmentDPL.java:86)
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:288)
at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:231)
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1900)
... 7 more

----

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**admin@dpl.net.in** · 2015-05-02 15:43:37

admin@dpl.net.in
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From: Durgapur, India
Registered: 2015-04-21
Posts: 26

Re: Android Email client/Mail sending through JAVA issue

admin@dpl.net.in wrote:

==== Required information ====
- iRedMail version: 0.9.0
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Web server (Apache or Nginx):Apache2
- Linux/BSD distribution name and version: Ubuntu 14.04
- Related log if you're reporting an issue:
====
We are using the Iredmail over web access but we are facing issues while configuring the standard Android client for our mail server.
We are entering the static IP/Domain name for both pop3 and SMTP
Security Type - We have tried all possible combinations (STARTTLS,SSL/TLS)
We are getting an error like this-" Could not open connection to the server"
Further, while sending any mail grammatically through Java mail API, we are getting the following error message:
Exception in thread "main" java.lang.RuntimeException: javax.mail.MessagingException: Could not connect to SMTP host: thedpl.in, port: 587;
nested exception is:
java.net.ConnectException: Connection refused: connect
at utility.SendMailAttachmentDPL.main(SendMailAttachmentDPL.java:91)
Caused by: javax.mail.MessagingException: Could not connect to SMTP host: thedpl.in, port: 587;
nested exception is:
java.net.ConnectException: Connection refused: connect
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1934)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:638)
at javax.mail.Service.connect(Service.java:317)
at javax.mail.Service.connect(Service.java:176)
at javax.mail.Service.connect(Service.java:125)
at javax.mail.Transport.send0(Transport.java:194)
at javax.mail.Transport.send(Transport.java:124)
at utility.SendMailAttachmentDPL.main(SendMailAttachmentDPL.java:86)
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:288)
at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:231)
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1900)
... 7 more

I guess I am doing wrong in putting the pop3 and smtp URL.....

**7t3chguy** · 2015-05-02 18:09:38

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Registered: 2015-01-08
Posts: 713

Re: Android Email client/Mail sending through JAVA issue

Pop3 (SSL) port 995
SMTP (TLS) port 587

the ports and SSL or TLS are very important.

**admin@dpl.net.in** · 2015-05-02 19:27:59

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From: Durgapur, India
Registered: 2015-04-21
Posts: 26

Re: Android Email client/Mail sending through JAVA issue

There are following options available in Android 4.4 email client

1. SSL/TLS
2. SSl/TLS(Accept all certificates)
3. STARTTLS
4. STARTTLS(Accept all certificates)

I have selected the 1st option and given the port number as mentioned by you but still I am receiving the same error- "Could not open connection to the server".

Tested the same configuration in MS Outlook also, fails there too.

**ZhangHuangbin** · 2015-05-02 21:46:14

ZhangHuangbin
iRedMail Developers
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Registered: 2009-05-06
Posts: 30,770

Re: Android Email client/Mail sending through JAVA issue

I guess your client IP address was blocked in iptables, i suggest disable fail2ban service and restart iptables to flush firewall rules first, then try to configure mail clients again.

Recommended setup is:

*) IMAP: port 143 over TLS
*) POP3: port 110 over TLS
*) SMTP: port 587 over TLS

**admin@dpl.net.in** · 2015-05-03 00:32:33

admin@dpl.net.in
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From: Durgapur, India
Registered: 2015-04-21
Posts: 26

Re: Android Email client/Mail sending through JAVA issue

ZhangHuangbin wrote:

I guess your client IP address was blocked in iptables, i suggest disable fail2ban service and restart iptables to flush firewall rules first, then try to configure mail clients again.
Recommended setup is:
*) IMAP: port 143 over TLS
*) POP3: port 110 over TLS
*) SMTP: port 587 over TLS

Now the error has changed to "can not safely connect to the server".

**7t3chguy** · 2015-05-03 00:33:52

7t3chguy
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Registered: 2015-01-08
Posts: 713

Re: Android Email client/Mail sending through JAVA issue

You should be using (Accept all certificates) by the way,
Android /Java only marks the Certificate as valid if it is very high trust or manually specified in the Mail Application

**admin@dpl.net.in** · 2015-05-03 00:51:19

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From: Durgapur, India
Registered: 2015-04-21
Posts: 26

Re: Android Email client/Mail sending through JAVA issue

I was doing it anyway. No luck. Same error.

I like to let you know that we have not installed any SSL certificate in our mail server, as a result we are getting an error message while accessing the mail through roundcube that tge connection is not secured. After we accept to proceed we get the login page. Will installing a SSL certificate solve the problem?

But Android app for roundcube works smoothly.

**ZhangHuangbin** · 2015-05-03 09:17:51

ZhangHuangbin
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Registered: 2009-05-06
Posts: 30,770

Re: Android Email client/Mail sending through JAVA issue

admin@dpl.net.in wrote:

I like to let you know that we have not installed any SSL certificate in our mail server

iRedMail installs a self-signed certificate by default, did you remove it?

Show us below info:

*) Command output: netstat -ntlp
*) Screenshot of setup on your phone.

**admin@dpl.net.in** · 2015-05-04 12:46:50

admin@dpl.net.in
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From: Durgapur, India
Registered: 2015-04-21
Posts: 26

Re: Android Email client/Mail sending through JAVA issue

ZhangHuangbin wrote:

admin@dpl.net.in wrote:
I like to let you know that we have not installed any SSL certificate in our mail server
iRedMail installs a self-signed certificate by default, did you remove it?
Show us below info:
*) Command output: netstat -ntlp
*) Screenshot of setup on your phone.

No, I have not deleted any certificate. iRedMail.crt is located at /etc/ssl/certs/

Output of netstat -ntlp:-

root@mail:~# netstat -ntlp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 127.0.1.1:53 0.0.0.0:* LISTEN 1060/dnsmasq
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 23677/cupsd
tcp 0 0 0.0.0.0:24 0.0.0.0:* LISTEN 962/dovecot
tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN 2622/master
tcp 0 0 0.0.0.0:4190 0.0.0.0:* LISTEN 962/dovecot
tcp 0 0 127.0.0.1:7777 0.0.0.0:* LISTEN 23708/python
tcp 0 0 0.0.0.0:993 0.0.0.0:* LISTEN 962/dovecot
tcp 0 0 0.0.0.0:995 0.0.0.0:* LISTEN 962/dovecot
tcp 0 0 127.0.0.1:10024 0.0.0.0:* LISTEN 1178/amavisd-new (m
tcp 0 0 127.0.0.1:10025 0.0.0.0:* LISTEN 2622/master
tcp 0 0 127.0.0.1:3306 0.0.0.0:* LISTEN 1047/mysqld
tcp 0 0 0.0.0.0:587 0.0.0.0:* LISTEN 2622/master
tcp 0 0 127.0.0.1:9998 0.0.0.0:* LISTEN 1178/amavisd-new (m
tcp 0 0 0.0.0.0:110 0.0.0.0:* LISTEN 962/dovecot
tcp 0 0 127.0.0.1:10031 0.0.0.0:* LISTEN 2643/perl
tcp 0 0 0.0.0.0:143 0.0.0.0:* LISTEN 962/dovecot
tcp6 0 0 ::1:631 :::* LISTEN 23677/cupsd
tcp6 0 0 :::24 :::* LISTEN 962/dovecot
tcp6 0 0 :::25 :::* LISTEN 2622/master
tcp6 0 0 :::443 :::* LISTEN 2716/apache2
tcp6 0 0 :::4190 :::* LISTEN 962/dovecot
tcp6 0 0 :::993 :::* LISTEN 962/dovecot
tcp6 0 0 :::995 :::* LISTEN 962/dovecot
tcp6 0 0 :::587 :::* LISTEN 2622/master
tcp6 0 0 :::110 :::* LISTEN 962/dovecot
tcp6 0 0 :::143 :::* LISTEN 962/dovecot
tcp6 0 0 :::80 :::* LISTEN 2716/apache2

The screen shot of set up also attached.

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**7t3chguy** · 2015-05-04 15:49:50

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Posts: 713

Re: Android Email client/Mail sending through JAVA issue

Any chance you use cloudflare or similar?

**admin@dpl.net.in** · 2015-05-04 15:57:23

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Registered: 2015-04-21
Posts: 26

Re: Android Email client/Mail sending through JAVA issue

7t3chguy wrote:

Any chance you use cloudflare or similar?

No, We have not used any such services.

**admin@dpl.net.in** · 2015-05-06 15:15:57

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From: Durgapur, India
Registered: 2015-04-21
Posts: 26

Re: Android Email client/Mail sending through JAVA issue

The problem has been rectified. The issue was related to certificate mismatch between the mail server and JRE from which the JavaMail API is being used. Java considers security as prime factor hence does not allow any self signed SSL to be used for SMTP. Hence the self signed certificate has to be imported to local JRE(from which the user will be sending the mails) through keytool utility.

Now regarding android client.... There are some mobile phone manufactures like XIAOMI who actually customize a lot on the stock Android email client. As we all know Apps on Android are written in Java, hence security is very very crucial and the server SSL certficate will also has to imported to the individual handset in case the mail server is using self signed SSL.

I am sure this information is going to save a lot of software professional from wasting a lot of time.

**ZhangHuangbin** · 2015-05-06 21:26:06

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Registered: 2009-05-06
Posts: 30,770

Re: Android Email client/Mail sending through JAVA issue

It's recommended to buy a ssl certificate to avoid this issue.

Dec 29, 2023: iRedMail-1.6.8 has been released.

Android Email client/Mail sending through JAVA issue

Posts: 14

1 Topic by admin@dpl.net.in 2015-05-02 15:34:45 (edited by admin@dpl.net.in 2015-05-02 15:39:39)

Topic: Android Email client/Mail sending through JAVA issue

2 Reply by admin@dpl.net.in 2015-05-02 15:43:37

Re: Android Email client/Mail sending through JAVA issue

3 Reply by 7t3chguy 2015-05-02 18:09:38

Re: Android Email client/Mail sending through JAVA issue

4 Reply by admin@dpl.net.in 2015-05-02 19:27:59 (edited by admin@dpl.net.in 2015-05-02 19:28:21)

Re: Android Email client/Mail sending through JAVA issue

5 Reply by ZhangHuangbin 2015-05-02 21:46:14

Re: Android Email client/Mail sending through JAVA issue

6 Reply by admin@dpl.net.in 2015-05-03 00:32:33

Re: Android Email client/Mail sending through JAVA issue

7 Reply by 7t3chguy 2015-05-03 00:33:52

Re: Android Email client/Mail sending through JAVA issue

8 Reply by admin@dpl.net.in 2015-05-03 00:51:19

Re: Android Email client/Mail sending through JAVA issue

9 Reply by ZhangHuangbin 2015-05-03 09:17:51

Re: Android Email client/Mail sending through JAVA issue

10 Reply by admin@dpl.net.in 2015-05-04 12:46:50 (edited by admin@dpl.net.in 2015-05-04 14:50:08)

Re: Android Email client/Mail sending through JAVA issue

11 Reply by 7t3chguy 2015-05-04 15:49:50

Re: Android Email client/Mail sending through JAVA issue

12 Reply by admin@dpl.net.in 2015-05-04 15:57:23

Re: Android Email client/Mail sending through JAVA issue

13 Reply by admin@dpl.net.in 2015-05-06 15:15:57

Re: Android Email client/Mail sending through JAVA issue

14 Reply by ZhangHuangbin 2015-05-06 21:26:06

Re: Android Email client/Mail sending through JAVA issue

Posts: 14