The mempool is currently a bit clogged due to high transaction volume. Therefore, it may take some time before your transaction gets confirmed. Also note that it takes some time for the dynamic block size to adjust properly. If it would be able to adjust too quickly, it would be too easy to cheat.

Note that you can increase your fee to ensure your transaction is mined quickly. This is done as follows.

CLI:

There are 5 different fee levels that you can choose, namely default/unimportant/normal/elevated/priority. These levels correspond to 0-4, respectively. Thus, if you, for instance, want to set the fee level to elevated, type set priority 3 in the CLI. In addition, the CLI will provide you with a brief overview of your transaction before you send it, so you can always check the fee before broadcasting it. Lastly, note that default is equal to normal. I’d personally advise to take elevated, as priority can get quite expensive.

GUI:

At the right top of the Send page you’ll see a button to increase or decrease the priority of the transaction.

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As it may take some time before your transaction is confirmed and shows up, it may be beneficial to verify that your transaction was correctly sent. This is done as follows.

GUI/CLI:

1. In the GUI, go to the history page and click on details of the transaction that was sent to Poloniex. | For the CLI, enter the following command: get_tx_key <transaction_hash>.

2. A window should pop up that shows the private tx key. Copy it. | For the CLI, copy the outcome of the get_tx_key command.

3. Go to this block explorer.

4. Enter your transaction ID / hash.

5. Now search the page for Prove sending.

6. Enter the private transaction key you obtained in step 2 into the first box. In addition, enter the address of the recipient in the second box.

7. Press on prove sending.

8. If it shows “output true” it proves you correctly sent your XMR to the recipient.

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MyMonero:

Unfortunately, MyMonero currently doesn’t have an option to obtain the private tx key. Therefore, it is currently impossible to use aforementioned method.

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Verifying that your transaction arrived (as a recipient)

CLI:

1. In the CLI type viewkey, pick the private view key.

2. Go to this blockexplorer

3. Enter your transaction ID / hash.

4. Now search the page for Decode outputs.

5. Enter your private view key. In addition, enter your address in the second box.

6. Press on decode outputs.

7. If it shows “output true” it proves you correctly received your XMR.

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GUI:

The GUI currently has no option to directly retrieve the viewkey. Therefore, a workaround is required.

Note that the GUI creates a separate directory for the wallet files, whereas the CLI stores them in the same directory. On Windows the GUI will store wallet files in documentsMonero, whereas on Linux and Mac OS X they are stored in $HOME/Monero.

Most convenient is to copy the wallet files that the GUI uses to the same directory as the CLI. Subsequently, open the CLI and enter the name of the wallet. Alternatively, you could specify the path of the wallet file (the .keys file) with the following flag:

--wallet-file <argument>

On Windows make sure to launch it from the command line. Go to the folder monero-wallet-cli is located and make sure your cursor isn’t located on any of the files. Subsequently do SHIFT + right click and it will give you an option to “Open command window here”. Lastly, type the following command:

monero-wallet-cli --wallet-file pathtowalletfile

On Linux and Mac OS X you should use the terminal to launch monero-wallet-cli. Note that this has to be done from the directory monero-wallet-cli is located in. The command is as follows:

./monero-wallet-cli --wallet-file path/to/wallet/file

After you’ve successfully opened the wallet the GUI created with the CLI, you simply have to type viewkey to obtain the viewkey (make sure to use the private viewkey) and address to obtain the address. Subsequently, perform the following steps to verify / decrypt your transaction.

1. Go to this blockexplorer

2. Enter your transaction ID / hash.

3. Now search the page for Decode outputs.

4. Enter your private view key. In addition, enter your address in the second box.

5. Press on decode outputs.

6. If it shows “output true” it proves you correctly received your XMR.

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MyMonero:

1. On MyMonero, go to account details.

2. Copy the private view key (called View Key (Private) on MyMonero).

3. Go to this blockexplorer.

4. Enter your transaction ID / hash.

5. Now search the page for Decode outputs.

6. Enter your private view key in the first box. In addition, enter your address in the second box.

7. Press on decode outputs.

8. If it shows “output true” it proves you correctly received your XMR.

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If you need any help, please comment in this thread and I’ll try to resolve your issue.